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      "label": "Change in accounts receivable",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "The cash flow adjustment for the change in receivables during the period. A positive value under this concept means receivables grew and reduced operating cash flow.",
      "observations": [
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": 2159000,
          "accn": "0001311230-17-000008",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-16",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 2598000,
          "accn": "0001311230-17-000008",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-16",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 11153000,
          "accn": "0001311230-17-000008",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-16",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 7268000,
          "accn": "0001311230-16-000013",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-15",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": -749000,
          "accn": "0001555667-15-000031",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-06",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 3359000,
          "accn": "0001193125-14-098366",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
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          "val": -2876000,
          "accn": "0001193125-13-105081",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-13",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 3441000,
          "accn": "0001193125-12-117498",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-15",
          "frame": "CY2009",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "IncreaseDecreaseInInventories",
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      "label": "Change in inventories",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "The cash flow adjustment for the change in inventories during the period. A positive value under this concept means inventory grew and reduced operating cash flow.",
      "observations": [
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": -867000,
          "accn": "0001311230-17-000008",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-16",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": -2682000,
          "accn": "0001311230-17-000008",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-16",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 2696000,
          "accn": "0001311230-17-000008",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-16",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": 2946000,
          "accn": "0001311230-16-000013",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-15",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": 3762000,
          "accn": "0001555667-15-000031",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-06",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 3129000,
          "accn": "0001193125-14-098366",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2011",
          "unit": "USD"
        }
      ]
    },
    {
      "tag": "IncreaseDecreaseInAccountsPayable",
      "taxonomy": "us-gaap",
      "label": "Change in accounts payable",
      "kind": "duration",
      "unitKind": "money",
      "meaning": "The cash flow adjustment for the change in payables during the period. A positive value under this concept means payables grew and added to operating cash flow.",
      "observations": [
        {
          "start": "2016-01-01",
          "end": "2016-12-31",
          "val": -690000,
          "accn": "0001311230-17-000008",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-16",
          "frame": "CY2016",
          "unit": "USD"
        },
        {
          "start": "2015-01-01",
          "end": "2015-12-31",
          "val": 1818000,
          "accn": "0001311230-17-000008",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-16",
          "frame": "CY2015",
          "unit": "USD"
        },
        {
          "start": "2014-01-01",
          "end": "2014-12-31",
          "val": 1610000,
          "accn": "0001311230-17-000008",
          "fy": 2016,
          "fp": "FY",
          "form": "10-K",
          "filed": "2017-03-16",
          "frame": "CY2014",
          "unit": "USD"
        },
        {
          "start": "2013-01-01",
          "end": "2013-12-31",
          "val": -2563000,
          "accn": "0001311230-16-000013",
          "fy": 2015,
          "fp": "FY",
          "form": "10-K",
          "filed": "2016-03-15",
          "frame": "CY2013",
          "unit": "USD"
        },
        {
          "start": "2012-01-01",
          "end": "2012-12-31",
          "val": -1396000,
          "accn": "0001555667-15-000031",
          "fy": 2014,
          "fp": "FY",
          "form": "10-K",
          "filed": "2015-03-06",
          "frame": "CY2012",
          "unit": "USD"
        },
        {
          "start": "2011-01-01",
          "end": "2011-12-31",
          "val": 3025000,
          "accn": "0001193125-14-098366",
          "fy": 2013,
          "fp": "FY",
          "form": "10-K",
          "filed": "2014-03-14",
          "frame": "CY2011",
          "unit": "USD"
        },
        {
          "start": "2010-01-01",
          "end": "2010-12-31",
          "val": 2035000,
          "accn": "0001193125-13-105081",
          "fy": 2012,
          "fp": "FY",
          "form": "10-K",
          "filed": "2013-03-13",
          "frame": "CY2010",
          "unit": "USD"
        },
        {
          "start": "2009-01-01",
          "end": "2009-12-31",
          "val": 1838000,
          "accn": "0001193125-12-117498",
          "fy": 2011,
          "fp": "FY",
          "form": "10-K",
          "filed": "2012-03-15",
          "frame": "CY2009",
          "unit": "USD"
        }
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