CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net loss	$ (18,330)	$ (21,951)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	1,498	261
Stock-based compensation expense	1,536	2,211
Gain on sale of fixed assets	(283)	(18)
Change in fair value of contingent consideration	800	1,100
Changes in assets and liabilities:
Accounts receivable	(20)	(1,300)
Other current assets	314	(117)
Accounts payable	733	110
Accrued expenses	2,845	(164)
Other current liabilities	126	0
Other liabilities	(724)	(25)
Net cash used in operating activities	(11,505)	(19,893)
Cash flows from investing activities:
Purchases of property and equipment	(2,735)	(233)
Proceeds from sale of fixed assets	314	17
Net cash used in investing activities	(2,421)	(216)
Cash flows from financing activities:
Proceeds from exercise of stock options	11	116
Net cash provided by financing activities	11	116
Effect of currency rate changes on cash and cash equivalents	(42)	0
Net decrease in cash and cash equivalents	(13,957)	(19,993)
Cash and cash equivalents at beginning of period	74,103	119,302
Cash and cash equivalents at end of period	$ 60,146	$ 99,309