Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating activities:
Net loss	$ (21,307)	$ (10,389)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	1,673	1,488
Depreciation and amortization	213	378
Amortization of debt issuance costs and debt discount	252	257
Impairment charges	813	0
Change in fair value of common stock warrant liabilities	(587)	(4,527)
Change in fair value of contingent consideration	600	1,300
Changes in operating assets and liabilities:
Trade accounts receivable	11,550	(3,504)
Inventory	(2,052)	2,586
Prepaid expenses and other current assets	155	(851)
Other assets	71	(2,530)
Accounts payable, accrued expenses and other liabilities	(2,525)	(4,298)
Deferred revenue	(273)	(1,326)
Net cash used in operating activities	(11,417)	(21,416)
Investing activities:
Purchases of property and equipment	(26)	(83)
Net cash used in investing activities	(26)	(83)
Financing activities:
Repayments of debt	0	(1,666)
Net cash used in financing activities	0	(1,666)
Net decrease in cash and cash equivalents	(11,443)	(23,165)
Cash and cash equivalents, beginning of the period	91,551	155,349
Cash and cash equivalents, end of the period	$ 80,108	$ 132,184