Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Total Stockholders' Equity	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Noncontrolling interest
Beginning balance (shares) at Dec. 31, 2012			4,765,504
Beginning balance at Dec. 31, 2012	$ (57,159)	$ (57,159)	$ 31	$ 739	$ (57,446)	$ (483)	$ 0	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	448	448		448
Series A and Series B preferred stock redemptions	(5,254)	(5,254)			(5,254)
Issuance of common stock warrant	45	45		45
Redemption of warrants	(950)	(950)			(950)
Exercise of stock options (shares)			1,227,206
Exercise of stock options	$ 389	389	$ 7	382
Redemption of common stock (shares)	(1,525,096)
Redemption of common stock	$ (5,173)	(5,173)				(5,173)
Accretion of dividends on redeemable convertible preferred stock	(7,470)	(7,470)			(7,470)
Net income (loss)	(24,356)	(24,356)			(24,356)
Ending balance (shares) at Dec. 31, 2013			4,467,614
Ending balance at Dec. 31, 2013	(99,480)	(99,480)	$ 38	1,614	(95,476)	(5,656)	0	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock in connection with initial public offering, net of underwriting discounts (shares)			11,500,000
Issuance of common stock in connection with IPO, net of underwriting discounts	209,990	209,990	$ 57	209,933
Stock-based compensation	3,095	3,095		3,095
Series A and Series B preferred stock redemptions	0
Conversion of preferred stock warrants to common stock warrants upon IPO	4,912	4,912		4,912
Conversion of preferred stock to common stock (shares)			47,457,356
Conversion of preferred stock to common stock	221,504	221,504	$ 237	221,267
Vesting of restricted stock units (shares)			11,667
Vesting of restricted stock units	6	6		6
Issuance of common stock warrant	64	64		64
Exercise of stock options and warrants (shares)			5,596,181
Exercise of stock options and warrants	2,106	2,106	$ 28	2,078
Accretion of dividends on redeemable convertible preferred stock	(12,884)	(12,884)			(12,884)
Net income (loss)	$ (18,708)	(18,708)			(18,708)
Ending balance (shares) at Dec. 31, 2014	69,031,719		69,032,818
Ending balance at Dec. 31, 2014	$ 310,605	310,605	$ 360	442,969	(127,068)	(5,656)	0	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation	10,750	10,750		10,750
Series A and Series B preferred stock redemptions	0
Investments by noncontrolling interests	7,873							7,873
Vesting of restricted stock units (shares)			88,124
Vesting of restricted stock units	$ 41	41	$ 1	40
Exercise of stock options (shares)	804,857		747,224
Exercise of stock options	$ 214	214	$ 4	210
Accretion of dividends on redeemable convertible preferred stock	0
Employee stock purchase plan (shares)			202,732
Employee stock purchase plan	3,244	3,244	$ 1	3,243
Repurchases of common stock (shares)			(10,690)
Repurchases of common stock	(187)	(187)
Other comprehensive Income	(678)	(372)					(372)	(306)
Other	(209)	(209)
Net income (loss)	$ (2,231)	(1,273)			(1,273)			(958)
Ending balance (shares) at Dec. 31, 2015	70,060,208		70,060,208
Ending balance at Dec. 31, 2015	$ 329,422	$ 322,813	$ 366	$ 457,003	$ (128,341)	$ (5,843)	$ (372)	$ 6,609