CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 119,856	$ 114,038
Short-term investments	144,169	209,444
Restricted cash	210	210
Inventory	2,189	0
Prepaid expenses and other current assets	9,140	9,557
Total current assets	275,564	333,249
Property and equipment, net	3,815	4,051
Operating lease right-of-use assets	5,982	6,566
Other long-term assets	5,797	5,588
Intangible asset	20,000	0
Deferred tax assets		10
Total assets	311,158	349,464
Current liabilities:
Accounts payable	2,763	503
Accrued expenses	30,316	29,199
Operating lease liabilities	2,374	2,107
Other current liabilities		37
Total current liabilities	35,453	31,846
Non-current liabilities:
Non-current operating lease liabilities	4,200	4,878
Other long-term liabilities	809	805
Total liabilities	40,462	37,529
Commitments and contingencies (Note 13)
Shareholders' equity:
Additional paid-in capital	837,656	829,424
Accumulated other comprehensive income	(21)	(34)
Accumulated deficit	(566,957)	(517,473)
Total shareholders' equity	270,696	311,935
Total liabilities and shareholders' equity	311,158	349,464
Class A common shares
Shareholders' equity:
Common stock value	8	8
Class B common shares
Shareholders' equity:
Common stock value	1	1
Class A1 common shares
Shareholders' equity:
Common stock value	5	5
Class B1 common shares
Shareholders' equity:
Common stock value	$ 4	$ 4