CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 87,271	$ 100,854
Short-term Investments	317,479	71,938
Prepaid expenses and other current assets	7,384	8,876
Total current assets	412,134	181,668
Property and equipment, net	3,006	3,195
Right-of-use asset	1,741	1,807
Intangible assets, net	5,000
Restricted cash	328	403
Total assets	422,209	187,073
Current liabilities:
Accounts payable	9,147	4,900
Accrued expenses and other current liabilities	7,150	12,559
Lease liability	553	535
Total current liabilities	16,850	17,994
Long-term liabilities:
Deferred tax liability	22,006
Lease liability	2,406	2,551
Total liabilities	41,262	20,545
Commitments and contingencies (Notes 5)
Stockholders' equity:
Preferred Stock, $0.001 par value: 10,000,000 shares authorized; no shares issued and outstanding at March 31, 2021 and December 31, 2020
Common stock, $0.001 par value: 120,000,000 shares authorized; 50,201,758 and 44,235,903 shares issued and outstanding March 31, 2021 and December 31, 2020, respectively	50	44
Additional paid-in capital	796,532	625,762
Accumulated other comprehensive (loss) income	(58)	49
Accumulated deficit	(415,577)	(459,327)
Total stockholders' equity	380,947	166,528
Total liabilities and stockholders' equity	$ 422,209	$ 187,073

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).