Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 215,962	$ 151,359
Short-term investment	24,521	0
Accounts receivable, net of allowances of approximately $5.2 million and $7.1 million at March 31, 2018 and December 31, 2017, respectively	7,740	3,496
Inventory, net	4,757	5,559
Prepaid expenses and other current assets	30,091	11,688
Current assets held for sale	0	391,202
Total current assets	283,071	563,304
Fixed assets, net	16,533	17,254
Goodwill	200,571	200,571
Restricted cash	5,543	5,541
Contingent purchase price from sale of businesses	326,536	80,700
Other assets	28,920	5,613
Total assets	861,174	872,983
Current liabilities:
Accounts payable	5,907	10,244
Accrued expenses	99,295	95,197
Current portion of contingent purchase price	4,854	4,995
Other current liabilities	397	4,476
Current liabilities held for sale	0	60,580
Total current liabilities	110,453	175,492
Contingent purchase price	14,344	14,655
Convertible senior notes	655,943	649,198
Other liabilities	12,778	8,724
Total liabilities	793,518	848,069
Stockholders’ equity:
Preferred stock, $1.00 par value per share, 5,000,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $0.001 par value per share, 187,500,000 authorized; 76,561,786 issued and 73,548,643 outstanding at March 31, 2018 and 76,191,958 issued and 73,178,815 outstanding at December 31, 2017	76	76
Additional paid-in capital	1,390,484	1,377,393
Treasury stock, at cost; 3,013,143 and 3,013,143 shares at March 31, 2018 and December 31, 2017, respectively	(90,016)	(90,016)
Accumulated deficit	(1,228,417)	(1,257,356)
Accumulated other comprehensive loss	(4,471)	(5,183)
Total stockholders’ equity	67,656	24,914
Total liabilities and stockholders’ equity	$ 861,174	$ 872,983