CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 167,953	$ 114,038
Short-term investments	57,913	209,444
Restricted cash	210	210
Accounts receivable, net	2,551
Inventory	6,381	0
Prepaid expenses and other current assets	9,802	9,557
Total current assets	244,810	333,249
Property and equipment, net	3,449	4,051
Operating lease right-of-use assets	5,386	6,566
Other long-term assets	5,813	5,588
Intangible asset	19,750	0
Deferred tax assets		10
Total assets	279,208	349,464
Current liabilities:
Accounts payable	4,156	503
Accrued expenses	31,064	29,199
Operating lease liabilities	2,636	2,107
Other current liabilities	926	37
Total current liabilities	38,782	31,846
Non-current liabilities:
Non-current operating lease liabilities	3,500	4,878
Other long-term liabilities	1,141	805
Total liabilities	43,423	37,529
Commitments and contingencies (Note 13)
Shareholders' equity:
Additional paid-in capital	844,260	829,424
Accumulated other comprehensive income (loss)	27	(34)
Accumulated deficit	(608,520)	(517,473)
Total shareholders' equity	235,785	311,935
Total liabilities and shareholders' equity	279,208	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