Annual report pursuant to Section 13 and 15(d)

QUARTERLY FINANCIAL DATA (UNAUDITED) - Schedule of Quarterly Consolidated Balance Sheet (Parenthetical) (Details)

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QUARTERLY FINANCIAL DATA (UNAUDITED) - Schedule of Quarterly Consolidated Balance Sheet (Parenthetical) (Details) - USD ($)
$ / shares in Units, $ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Apr. 18, 2017
Mar. 31, 2017
Allowance for Doubtful Accounts Receivable, Current $ 68       $ 320   $ 317 $ 29   $ 16
Preferred Stock, Shares Authorized 20,000,000 20,000,000 20,000,000 20,000,000 20,000,000 20,000,000 20,000,000 20,000,000   20,000,000
Preferred Stock, Shares Issued 0 0 0 0 0 0 0 0   0
Common Stock, Par or Stated Value Per Share $ 0.01 $ 0.01 $ 0.01 $ 0.01 $ 0.01 $ 0.01 $ 0.01 $ 0.01 $ 0.01 $ 0.01
Common Stock, Shares Authorized 1,000,000,000 1,000,000,000 1,000,000,000 1,000,000,000 1,000,000,000 1,000,000,000 1,000,000,000 1,000,000,000   1,000,000,000
Common Stock, Shares, Issued 36,040,000 35,553,000 35,556,000 35,443,000 35,443,000 35,077,000 34,663,000 34,101,000   34,063,000
Common Stock, Shares, Outstanding 36,040,000 35,553,000 35,556,000 35,443,000 35,443,000 35,077,000 34,663,000 34,101,000   34,063,000