CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 108,382	$ 217,431
Short-term investments	47,491	0
Assets Held For Sale	28,907	0
Prepaid expenses and other current assets	7,129	2,133
Total current assets	191,909	219,564
Property and equipment, net	2,252	37,002
Right-of-use assets	15,607	5,897
Restricted cash	1,953	1,274
Total assets	211,721	263,737
Current liabilities:
Accounts payable	2,366	4,722
Accrued expenses and other liabilities	11,406	9,803
Operating Lease Liabilities	246	2,501
Deferred revenue	3,208	5,632
Total current liabilities	17,226	22,658
Non-current liabilities:
Operating lease liabilities, net of current portion	23,688	12,941
Deferred revenue, net of current portion	1,156	32,143
Total liabilities	42,070	67,742
Stockholders’ equity:
Preferred stock, $0.0001 par value, 10,000,000 shares authorized as of December 31, 2021 and 2020; no shares issued and outstanding at December 31, 2021 and 2020
Common stock, $0.0001 par value; 200,000,000 shares authorized as of December 31, 2021 and 2020; 57,150,274 and 50,268,666 shares issued as of December 31, 2021 and 2020, respectively; and 57,150,274 and 50,265,575 shares outstanding as of December 31, 2021and 2020, respectively	6	5
Additional paid-in capital	593,784	524,358
Accumulated other comprehensive gain	(7)	0
Accumulated deficit	(424,132)	(328,368)
Total stockholders’ equity	169,651	195,995
Total liabilities and stockholders' equity	$ 211,721	$ 263,737