Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 253,252	$ 177,023
Accounts receivable, net	105,379	11,279
Related party accounts receivable, net		105,967
Inventory, net		648
Prepaid expenses and other current assets	14,394	10,685
Restricted cash	1,250	1,250
Total current assets	374,275	306,852
Restricted cash, net of current portion	971	971
Accounts receivable, net of current portion	22,995	32,597
Property and equipment, net	11,190	12,429
Operating lease right-of-use assets	17,156	17,743
Convertible note hedges	16,131	31,366
Other assets	820	790
Total assets	443,538	402,748
Current liabilities:
Accounts payable	2,104	3,978
Related party accounts payable, net	751	1,509
Accrued research and development costs	2,400	2,956
Accrued expenses and other current liabilities	17,955	30,465
Current portion of operating lease liabilities	2,610	1,146
Deferred revenue	875	875
Total current liabilities	26,695	40,929
Note hedge warrants	12,958	24,260
Convertible senior notes	418,924	407,994
Operating lease obligations, net of current portion	21,211	22,082
Other liabilities	602	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 159,976,245 issued and outstanding at June 30, 2020 and 500,000,000 shares authorized and 157,535,962 shares issued and outstanding at December 31, 2019	160	158
Additional paid-in capital	1,506,671	1,478,823
Accumulated deficit	(1,543,683)	(1,572,232)
Total stockholders' deficit	(36,852)	(93,251)
Total liabilities and stockholders' deficit	$ 443,538	$ 402,748