Unaudited Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Allowance for accounts receivable	$ 925	$ 1,565
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, authorized	300,000,000	300,000,000
Common stock, issued	75,495,658	74,552,006
Common stock, outstanding	75,495,658	74,552,006