Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Restricted cash	$ 200	$ 200
Trade receivables, allowances	500	500
Receivables from related party	1,600	700
Receivables held in escrow, allowances	$ 200	$ 100
Common stock, par value per share	$ 0.001	$ 0.001
Common stock, shares authorized (in thousands)	150,000	150,000
Common stock, shares, issued (in thousands)	55,384	55,089
Common stock, shares, outstanding (in thousands)	55,384	55,089