Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 184,497	$ 147,161
Current portion of accounts receivable	30,000	20,000
Prepaid expenses	10,434	9,626
Other current assets	5,111	8,689
Total current assets	230,042	185,476
Long-term assets:
Accounts receivable, net of current portion		30,000
Property and equipment, net	29,198	36,368
Operating lease right-of-use assets	16,232	18,101
Restricted cash	3,651	3,647
Other assets	115	10,658
Total long-term assets	49,196	98,774
Total assets	279,238	284,250
Current liabilities:
Accounts payable	13,795	9,073
Accrued expenses and other current liabilities	11,971	16,185
Current portion of deferred revenue	91,560	89,652
Current portion of operating lease liability	3,714	3,243
Total current liabilities	121,040	118,153
Long-term liabilities:
Deferred revenue, net of current portion	41,481	63,466
Operating lease liability, net of current portion	25,591	29,304
Other liabilities	474	1,721
Total long-term liabilities	67,546	94,491
Total liabilities	188,586	212,644
Series A preferred shares, no par value; 3,901,348 shares issued and outstanding at December 31, 2020 and 2019	7,874	7,874
Shareholders’ equity:
Ordinary shares, no par value; 48,778,678 and 34,340,690 shares issued and outstanding at December 31, 2020 and 2019, respectively	694,085	539,547
Additional paid-in capital	71,573	57,277
Accumulated other comprehensive income	389	267
Accumulated deficit	(683,269)	(533,359)
Total shareholders’ equity	82,778	63,732
Total liabilities, Series A preferred shares and shareholders’ equity	$ 279,238	$ 284,250