Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Operating activities:
Net income	$ (46,215)	$ 34,986
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Stock-based compensation	5,203	5,981
Depreciation and amortization	966	1,234
Amortization of debt issuance costs and non-cash interest charges	954	684
Accrued income taxes	0	3,535
Impairment loss on investments	0	5,485
Gain on sale of business	0	89,099
Change in fair value of warrant liabilities	(5,148)	861
Change in fair value of contingent purchase consideration	2,800	(1,900)
Changes in operating assets and liabilities:
Trade accounts receivable	(5,124)	4,918
Inventory	2,633	3,029
Prepaid expenses and other current assets	(3,863)	(2,299)
Other assets	(139)	999
Accounts payable and accrued expenses	(4,339)	(11,605)
Deferred income taxes	(1,025)	0
Deferred rent	(74)	(26)
Deferred revenue	(1,012)	(7,635)
Net cash used by operating activities	(54,383)	(50,852)
Investing activities:
Purchases of property and equipment	(103)	(214)
Proceeds from sale of business	0	80,926
Change in restricted cash from sale of business	(10,002)	1,501
Net cash provided by investing activities	9,899	79,211
Financing activities:
Proceeds of long-term debt	2,167	0
Repayment of revolving credit facility	0	(1,450)
Principal payments on long-term debt	(3,334)	0
Proceeds from exercise of common stock options and warrants	6	1,435
Proceeds from issuance of common stock, net	162	92,134
Net cash provided by (used in) financing activities	(999)	92,119
Net increase (decrease) in cash and cash equivalents	(45,483)	120,478
Cash and cash equivalents at beginning of period	155,349	42,205
Cash and cash equivalents at end of period	$ 109,866	$ 162,683