CONSOLIDATED STATEMENTS OF STOCKHOLDERS' (DEFICIT) EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional paid-in capital	Shareholder note receivable	Treasury stock	Accumulated other comprehensive income (loss)	Accumulated deficit
Balance beginning, value at Dec. 31, 2013	$ 171,676	$ 1	$ 403,577		$ (97)	$ 3,877	$ (235,682)
Balance beginning, shares at Dec. 31, 2013		8,133
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	2,690		2,690
Exercise of stock options	29		29
Exercise of stock options, shares		2
Repurchase and/or forfeiture of common stock	(3)		(3)
Repurchase and/or forfeiture of common stock, shares		(22)
Shares issued for consulting services	1,864		1,864
Shares issued for consulting services, shares		111
Issuance of common stock for employee stock purchase plan	671		671
Issuance of common stock for employee stock purchase plan, shares		51
Issuance of common stock for restricted share awards granted to employees, shares		41
Shareholder note receivable			5,000	$ (5,000)
Issuance of common stock for acquired technology	102		102
Issuance of common stock for acquired technology, shares		6
Foreign currency translation adjustments	(15,193)					(15,193)
Net loss	(12,882)						(12,882)
Balance ending, value at Dec. 31, 2014	148,954	$ 1	413,930	(5,000)	(97)	(11,316)	(248,564)
Balance ending, shares at Dec. 31, 2014		8,321
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	2,562		2,562
Repurchase and/or forfeiture of common stock, shares		(22)
Shares issued for consulting services	81		81
Shares issued for consulting services, shares		110
Issuance of common stock for employee stock purchase plan	375		375
Issuance of common stock for employee stock purchase plan, shares		72
Issuance of common stock for restricted share awards granted to employees, shares		24
Issuance of common stock for acquired technology, shares		6
Foreign currency translation adjustments	(9,872)					(9,872)
Net loss	(178,676)						(178,676)
Balance ending, value at Dec. 31, 2015	(36,576)	$ 1	416,948	(5,000)	(97)	(21,188)	(427,240)
Balance ending, shares at Dec. 31, 2015		8,513
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	1,626		1,626
Repurchase and/or forfeiture of common stock, shares		(1)
Shares issued for consulting services	25		25
Shares issued for consulting services, shares		210
Issuance of common stock for employee stock purchase plan	114		114
Issuance of common stock for employee stock purchase plan, shares		58
Warrant conversion, value	1,074		1,074
Warrant conversion. shares		269
Foreign currency translation adjustments	22,158					22,158
Net loss	(29,925)						(29,925)
Balance ending, value at Dec. 31, 2016	$ (41,504)	$ 1	$ 419,787	$ (5,000)	$ (97)	$ 970	$ (457,165)
Balance ending, shares at Dec. 31, 2016		9,049