Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Operating activities:
Net income	$ 49,602	$ 41,933
Adjustments to reconcile net loss to net cash used in operating activities:
Stock-based compensation	4,465	5,292
Stock-based compensation, restructuring	153	0
Depreciation and amortization	814	820
Amortization of debt issuance costs and non-cash interest charges	481	287
Accrued income taxes	6,521	0
Loss on early extinguishment of debt	0	1,254
Gain on sale of business	(89,053)	(79,980)
Loss on impairment of long-lived assets	0	838
Change in fair value of warrant liabilities	564	(18,470)
Change in fair value of embedded derivatives	0	14
Change in fair value of contingent purchase consideration	(1,600)	0
Changes in operating assets and liabilities:
Trade accounts receivable	2,559	745
Inventory	542	(5,720)
Prepaid expenses and other current assets	(3,493)	(9,378)
Other assets	860	(4,995)
Accounts payable and accrued expenses	(9,876)	10,666
Deferred revenue	(5,413)	15,990
Net cash used in operating activities	(42,874)	(40,704)
Investing activities:
Purchases of property and equipment	(68)	83
Proceeds from sale of business	80,926	89,624
Change in restricted cash from sale of business	(1,500)	(8,500)
Net cash provided by investing activities	79,358	81,207
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	7	1,508
Proceeds from issuance of common stock	126	244
Net cash provided by financing activities	(1,317)	(31,289)
Net increase in cash and cash equivalents	35,167	9,214
Cash and cash equivalents at beginning of period	42,205	72,021
Cash and cash equivalents at end of period	77,372	81,235
Noncash investing and financing activities:
Deferred financing charges in accounts payable	$ 294	$ 0