Consolidated Balance Sheets-Unaudited - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 55,592	$ 36,112
Short-term investments	193,545	235,547
Accounts receivable, net	30,135	56,532
Inventory	4,147	4,243
Prepaid expenses and other current assets	8,195	5,320
Total current assets	291,614	337,754
Property and equipment, net of accumulated depreciation and amortization of $61,302 and $61,741, respectively	13,582	14,047
Goodwill	44,543	44,543
Intangible assets, net of accumulated amortization of $5,444 and $5,003, respectively	19,275	19,716
Other assets	1,553	1,655
Total assets	370,567	417,715
Current liabilities:
Accounts payable	18,236	12,178
Accrued liabilities	51,349	42,151
Current portion of long-term debt, net of deferred issuance costs	10,734	11,012
Total current liabilities	80,319	65,341
Long-term debt, net of deferred issuance costs	234,488	234,171
Other long-term liabilities	983	1,102
Total liabilities	315,790	300,614
Commitments and contingencies
Equity:
Preferred stock, $.01 par value; 5,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $.001 par value; 225,000 shares authorized; 107,711 and 106,679 shares issued, respectively	108	106
Additional paid-in capital	1,466,604	1,462,172
Accumulated deficit	(1,408,055)	(1,341,444)
Accumulated other comprehensive loss	860	84
Treasury stock, at cost, 741 and 407 shares, respectively	(4,740)	(3,817)
Total stockholder's equity (deficit)	54,777	117,101
Total liabilities and equity	$ 370,567	$ 417,715