Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 41,408	$ 70,055
Restricted cash	5,011	4,725
Investment debt securities, available-for-sale	507,628	582,567
Accounts receivable, net of allowance for credit losses of $179 and $0, respectively	43,857	38,044
Prepaid expenses and other current assets	30,287	25,924
Total current assets	628,191	721,315
Fixed assets, net	4,846	5,202
Inventory	10,260	8,462
Security deposits	6,644	6,661
Other assets	12,440	13,246
Total assets	662,381	754,886
Current liabilities:
Accounts payable, accrued expenses and other liabilities	144,518	153,968
Short-term interest payable	5,450	8,037
Total current liabilities	149,968	162,005
Long-term liabilities:
Long-term debt	538,968	532,078
Long-term other liabilities	8,164	9,247
Total liabilities	697,100	703,330
Commitments and contingencies (Note 16)
Stockholders' equity:
Common stock par value $0.001 per share; 45,000,000 shares authorized; 32,937,431 and 32,853,066 shares issued and outstanding as of March 31, 2020 and December 31, 2019, respectively	33	33
Additional paid-in capital	2,185,501	2,176,133
Accumulated other comprehensive loss, net	(3,804)	(1,144)
Accumulated deficit	(2,216,449)	(2,123,466)
Total stockholders' (deficit) equity	(34,719)	51,556
Total liabilities and stockholders' (deficit) equity	$ 662,381	$ 754,886