CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	[1]
Statement Of Financial Position [Abstract]
Allowance for doubtful accounts	$ 132	$ 93
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	250,000,000	250,000,000
Common stock, shares issued	163,282,081	161,526,044
Common stock, shares outstanding	163,282,081	161,526,044

[1] December 31, 2015 balances were derived from the audited Consolidated Financial Statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2015, filed with the Securities and Exchange Commission (the SEC) on February 29, 2016.