CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 113,447	$ 22,063
Short-term marketable securities	118,227	32,068
Accounts receivable, net	939	772
Prepaid expenses and other current assets	8,648	2,590
Total current assets	241,261	57,493
Marketable securities	34,503
Property and equipment, net	1,287	1,654
Intangible assets	7,086	7,123
Other assets	3,909	4,514
Total assets	288,046	70,784
Current liabilities:
Accounts payable	4,244	5,254
Accrued expenses	6,931	5,906
Current portion of lease liabilities	647	603
Discontinued operations - current liabilities	3,094	3,111
Total current liabilities	14,916	14,874
Other liabilities	2,917	3,179
Long-term debt, net	10,731	10,653
Contingent consideration	25,300	4,061
Deferred tax liability	367	367
Total liabilities	54,231	33,134
Commitments and contingencies (Note 17)
Stockholders' Equity:
Preferred stock, $0.00001 par value; 10,000,000 shares authorized and no shares issued or outstanding at June 30, 2021 and December 31, 2020
Common stock, $0.00001 par value; 100,000,000 shares authorized at June 30, 2021 and December 31, 2020; 61,204,987 and 45,109,314 shares issued and outstanding at June 30, 2021 and December 31, 2020, respectively	1
Additional paid-in capital	785,455	542,286
Accumulated other comprehensive loss	(184)	(94)
Accumulated deficit	(551,457)	(504,542)
Total stockholders' equity	233,815	37,650
Total liabilities and stockholders' equity	$ 288,046	$ 70,784