CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 166,916	$ 62,070
Marketable securities	338,193	189,085
Accounts receivable, net	3,824	0
Inventory	1,026	0
Prepaid expenses	7,279	8,593
Acquisition holdback placed in escrow	0	25,000
Other current assets	4,936	2,491
Total current assets	522,174	287,239
Property and equipment, net	8,724	9,424
Operating lease right-of-use assets	7,748	7,774
Intangible asset, net	98,558	102,500
Goodwill	6,234	6,234
Other non-current assets	7,692	1,079
Total assets	651,130	414,250
Current liabilities:
Accounts payable	11,945	7,979
Accrued and other current liabilities	54,964	30,117
Acquisition holdback liability	0	24,444
Deferred revenue, current	5,318	5,927
Current portion of operating lease liabilities	1,688	1,322
Current portion of contingent consideration	8,800	25,600
Total current liabilities	82,715	95,389
Deferred revenue, non-current	5,479	7,425
Operating lease liabilities, net of current portion	10,314	10,752
Contingent consideration, net of current portion	33,600	38,200
Deferred tax liability	0	17,425
Convertible Senior Notes	149,353	0
Total liabilities	281,461	169,191
Commitments and contingencies (Note 12)
Stockholders’ equity:
Preferred stock, $0.001 par value; 10,000 shares authorized, none issued and outstanding	0	0
Common stock, $0.001 par value; 100,000 and 50,000 shares authorized and 55,736 and 45,272 shares issued and outstanding at December 31, 2020 and 2019, respectively	56	45
Additional paid-in capital	1,694,524	1,360,092
Accumulated other comprehensive (loss) income	(71)	379
Accumulated deficit	(1,324,840)	(1,115,457)
Total stockholders’ equity	369,669	245,059
Total liabilities and stockholders’ equity	$ 651,130	$ 414,250