Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities
Net income (loss)	$ 480,686	$ (89,616)
Income (loss) from discontinued operations	539,538	(268)
Loss from continuing operations	(58,852)	(89,348)
Adjustments to reconcile net loss to net cash used in operating activities
Non-cash interest expense	2,374	3,505
Loss on extinguishment of debt	4,887	14,566
Benefit from intraperiod tax allocation	(30,239)
Depreciation and amortization expense	2,058	2,333
Non-cash activity related to discontinued operations	15,025
(Gain) loss on sale of property and equipment	(512)	228
Stock-based compensation expense	9,529	6,077
Changes in operating assets and liabilities:
Accounts receivable	232	11
Prepaid expenses and other current assets	(4,022)	605
Income taxes payable	8,141
Accounts payable, accrued expenses and other	2,494	(8,454)
Deferred rent	(209)	579
Net cash used in continuing operations for operating activities	(49,094)	(69,898)
Net cash used in discontinuing operations for operating activities	(46,416)	(34,528)
Net cash used in operating activities	(95,510)	(104,426)
Cash flows from investing activities
Purchase of property and equipment	(287)	(2,050)
Proceeds from maturities and sales of available for sale securities		23,000
Proceeds on sale of property and equipment	1,104
Purchases of available for sale securities		(84,262)
Proceeds from sale of business	575,000
Changes in restricted cash	(60,008)
Net cash provided by (used in) investing activities	515,809	(63,312)
Cash flows from financing activities
Proceeds from exercise of options to purchase common stock	6,079	2,598
Repayment of debt	(175,000)
Payment of dividend	(140,000)
Proceeds from issuance of Silver Creek convertible promissory notes		1,025
Net cash provided by (used in) financing activities	(306,322)	3,623
Net increase (decrease) in cash and cash equivalents	113,977	(164,115)
Cash and cash equivalents, beginning of period	21,524	185,606
Cash and cash equivalents, end of period	135,501	21,491
Non-cash investing and financing activities
Purchases of property and equipment in accounts payable, accrued expenses and other	349	434
Receivables related to stock option exercises in prepaid expenses and other current assets		13
Receivables related to property and equipment sale in other current assets	155
Conversion of convertible debt into shares of common stock		$ 64,209
Supplemental disclosure of cash flows
Cash paid for interest	28,872
Silver Creek Inc. [Member]
Cash flows from financing activities
Proceeds from issuance of Series C preferred stock by Silver Creek Inc., net of issuance costs	2,599
Cash and cash equivalents, end of period	$ 2,600