Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from operating activities:
Net loss	$ (47,671)	$ (11,213)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	2,232	1,489
Stock-based compensation	2,882	2,211
Change in fair value of derivative liabilities	5,088	0
Change in fair value of contingent consideration related to acquisition	0	100
Accretion of interest & amortization of deferred financing costs on convertible notes	2,279	976
Non-cash foreign exchange loss	270	111
Changes in operating assets and liabilities:
Accounts receivable and other receivables	(4,186)	48
Inventories	1,240	(4,637)
Prepaid expenses and other current assets	638	681
Accounts payable	(4,067)	859
Accrued payroll	4,498	(2,482)
Accrued expenses and other liabilities	3,439	130
Net cash used in operating activities	(33,358)	(11,727)
Cash flows from investing activities:
Purchases of marketable securities	0	(28,059)
Maturities of marketable securities	9,350	34,430
Purchases of property and equipment	(891)	(2,174)
Acquisition of business, net of cash acquired of $24,012	(60,622)	0
Net cash provided by (used in) investing activities	(52,163)	4,197
Cash flows from financing activities:
Proceeds from exercise of stock options	500	1,642
Minimum tax withholding paid on behalf of employees for restricted stock units	0	(35)
Net cash provided by financing activities	500	1,607
Effect of exchange rate changes on cash and cash equivalents	241	(692)
Net decrease in cash and cash equivalents	(84,780)	(6,615)
Cash and cash equivalents, beginning of period	124,553	26,798
Cash and cash equivalents, end of period	39,773	20,183
Supplemental disclosure of cash flow information:
Cash paid for income taxes	110	35
Non-cash investing and financing activities:
Acquisition of property and equipment included in accounts payable	76	0
Fair value of common stock issued for business acquisition	100,812	0
Fair value of warrants issued for business acquisition	$ 44	$ 0