Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 231,143	$ 177,023
Accounts receivable, net	17,703	11,279
Related party accounts receivable, net	73,404	105,967
Inventory, net		648
Prepaid expenses and other current assets	10,443	10,685
Restricted cash	1,250	1,250
Total current assets	333,943	306,852
Restricted cash, net of current portion	971	971
Accounts receivable, net of current portion	22,795	32,597
Property and equipment, net	12,164	12,429
Operating lease right-of-use assets	17,447	17,743
Convertible note hedges	15,847	31,366
Other assets	838	790
Total assets	404,005	402,748
Current liabilities:
Accounts payable	2,781	3,978
Related party accounts payable, net	1,058	1,509
Accrued research and development costs	2,286	2,956
Accrued expenses and other current liabilities	18,719	30,465
Current portion of operating lease liabilities	1,876	1,146
Deferred revenue	875	875
Total current liabilities	27,595	40,929
Note hedge warrants	12,207	24,260
Convertible senior notes	413,409	407,994
Operating lease obligations, net of current portion	21,646	22,082
Other liabilities	705	734
Commitments and contingencies
Stockholders' deficit:
Preferred stock, $0.001 par value, 75,000,000 shares authorized, no shares issued and outstanding
Class A Common Stock, $0.001 par value, 500,000,000 shares authorized and 159,368,126 issued and outstanding at March 31, 2020 and 500,000,000 shares authorized and 157,535,962 shares issued and outstanding at December 31, 2019	159	158
Additional paid-in capital	1,497,171	1,478,823
Accumulated deficit	(1,568,887)	(1,572,232)
Total stockholders' deficit	(71,557)	(93,251)
Total liabilities and stockholders' deficit	$ 404,005	$ 402,748