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Stockholders' Deficit - Treasury Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended
	Aug. 31, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Equity, Class of Treasury Stock [Line Items]
Shares repurchased (in shares)	26,659	589,320
Purchase price (in dollars per share)	$ 6.91	$ 2.04
Repurchase of common stock		$ 1,200	$ 182	$ 1,205	$ 182	$ 1,205
Share price (in dollars per share)		$ 1.49		$ 1.49		$ 1.49
Treasury stock (in shares)			615,980		615,980		589,320
Accumulated Deficit
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock		$ 321	$ 58	$ 321	$ 58	$ 321
Treasury Stock
Equity, Class of Treasury Stock [Line Items]
Repurchase of common stock		$ 884,000	$ 124	$ 884	$ 124	$ 884

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Total cost of shares repurchased divided by the total number of shares repurchased.

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