Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Operating activities:
Net income	$ 34,986	$ 29,108
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	5,821	7,334
Stock-based compensation, restructuring	160	0
Depreciation and amortization	1,234	1,227
Amortization of debt issuance costs and non-cash interest charges	684	370
Accrued income taxes	3,535	0
Loss on early extinguishment of debt	0	1,254
Impairment loss on investments	5,485	0
Gain on sale of business	(89,099)	(79,980)
Loss on impairment of long-lived assets	0	838
Change in fair value of warrant liabilities	861	(26,418)
Change in fair value of embedded derivatives	0	14
Change in fair value of contingent purchase consideration	(1,900)	0
Changes in operating assets and liabilities:
Trade accounts receivable	4,918	779
Inventory	3,029	(9,335)
Prepaid expenses and other current assets	(2,299)	(10,595)
Other assets	999	(4,978)
Accounts payable and accrued expenses	(11,605)	2,377
Deferred rent	(26)	0
Deferred revenue	(7,635)	16,761
Net cash used in operating activities	(50,852)	(71,244)
Investing activities:
Purchases of property and equipment	(214)	(85)
Proceeds from sale of business	80,926	89,624
Change in restricted cash from sale of business	(1,501)	(8,500)
Net cash provided by investing activities	79,211	81,039
Financing activities:
Proceeds of working capital advance	0	7,000
Repayment of revolving credit facility	(1,450)	0
Inventory	0	(40,041)
Proceeds from exercise of common stock options and warrants	1,435	1,508
Proceeds from issuance of common stock, net	92,134	244
Net cash provided by financing activities	92,119	(31,289)
Net increase (decrease) in cash and cash equivalents	120,478	(21,494)
Cash and cash equivalents at beginning of period	42,205	72,021
Cash and cash equivalents at end of period	$ 162,683	$ 50,527