Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Operating activities:
Net loss for basic EPS	$ (22,861)	$ (20,932)
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	1,871	2,507
Depreciation and amortization	393	406
Amortization of debt issuance costs and non-cash interest	257	161
Change in fair value of warrant liabilities	(410)	(8,269)
Change in fair value of embedded derivatives	0	14
Change in fair value of contingent purchase consideration	(1,000)	0
Changes in operating assets and liabilities:
Trade accounts receivable	4,207	(5,015)
Inventory, net	(450)	(4,918)
Prepaid expenses and other current assets	(1,853)	882
Other assets	(621)	(534)
Accounts payable and accrued expenses	947	6,937
Deferred rent	(26)	(26)
Deferred revenue	(2,401)	5,963
Net cash used in operating activities	(21,947)	(22,824)
Investing activities:
Purchases of property and equipment	(54)	(15)
Net cash used in investing activities	(54)	(15)
Financing activities:
Proceeds from revolving credit facility	1,450	0
Repayment of debt	(343)	0
Proceeds from exercise of common stock options	3	1,502
Net cash provided by financing activities	1,110	1,502
Net (decrease) increase in cash and cash equivalents	(20,891)	(21,337)
Cash and cash equivalents at beginning of period	42,205	72,021
Cash and cash equivalents at end of period	21,314	50,684
Noncash investing and financing activities:
Change in purchases of property and equipment in accounts payable	$ 0	$ (310)