Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Retained Earnings (Accumulated Deficit)	$ (99,001)				$ (99,001)
Additional Paid in Capital	$ 398,787		$ 398,787
Beginning Balance (in shares) at Dec. 31, 2016	49,378	49,378
Beginning Balance at Dec. 31, 2016	$ 299,513	$ 0		$ (273)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of common stock options (in shares)		94
Exercise of common stock options	368		368
Shares Paid for Tax Withholding for Share Based Compensation		(43)
Issuance of common stock related to RSU vesting (in shares)		118
Stock-based compensation	6,405		6,405
Other comprehensive loss	93			93
Net income (loss)	$ (15,840)				(15,840)
Ending Balance (in shares) at Mar. 31, 2017	49,547	49,547
Ending Balance at Mar. 31, 2017	$ 290,539	$ 0	$ 405,560	$ (180)	$ (114,841)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Retained Earnings (Accumulated Deficit)	(114,841)
Additional Paid in Capital	$ 405,560