CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
CURRENT ASSETS
Cash and cash equivalents	$ 179,740	$ 27,711
Trade receivables	24,190	17,134
Prepaid expenses and other current assets	7,826	2,769
Deferred contract acquisition and fulfillment costs, current	8,702	5,848
Total current assets	220,458	53,462
NON-CURRENT ASSETS
Property and equipment, net	8,243	4,147
Other assets, noncurrent	2,371	3,564
Deferred contract acquisition and fulfillment costs, noncurrent	23,202	15,876
Intangible assets, net	2,127	2,835
Goodwill	11,070	11,070
Total non-current assets	47,013	37,492
TOTAL ASSETS	267,471	90,954
CURRENT LIABILITIES
Current portion of long-term loans	2,295	1,000
Current portion of long-term lease liabilities	525	1,738
Trade payables	4,418	5,045
Employees and payroll accruals	20,540	16,275
Accrued expenses and other current liabilities	17,212	11,251
Deferred revenue	63,014	47,685
Total current liabilities	108,004	82,994
NON-CURRENT LIABILITIES
Deferred revenue, noncurrent	1,750	1,858
Long-term loans, net of current portion	58,992	47,160
Other liabilities, noncurrent	2,386	2,706
Warrants to purchase preferred and common stock	0	56,780
Total non-current liabilities	63,128	108,504
TOTAL LIABILITIES	171,132	191,498
COMMITMENTS AND CONTINGENCIES (NOTE 6)
Total mezzanine equity	0	160,112
STOCKHOLDERS' EQUITY (DEFICIT)
Preferred stock, $0.0001 par value per share, 20,000,000 and 0 shares authorized as of September 30, 2021 and December 31, 2020, respectively; 0 issued and outstanding as of September 30, 2021 and December 31, 2020	0	0
Common stock, $ 0.0001 par value per share, 1,000,000,000 and 157,500,000 shares authorized as of September 30, 2021, and December 31, 2020, respectively; 134,261,190 and 33,153,112 shares issued as of September 30, 2021 and December 31, 2020, respectively; 126,576,000 and 25,467,922 shares outstanding as of September 30, 2021 and December 31, 2020, respectively;	13	2
Treasury stock – 7,685,190 shares of common stock, $0.0001 par value per share, as of September 30, 2021 and December 31, 2020	(4,881)	(4,881)
Additional paid-in capital	407,915	8,388
Receivables on account of stock	0	(882)
Accumulated deficit	(306,708)	(263,283)
Total stockholders’ equity (deficit)	96,339	(260,656)
TOTAL LIABILITIES, CONVERTIBLE AND REDEEMABLE CONVERTIBLE PREFERRED STOCKS AND STOCKHOLDERS’ EQUITY (DEFICIT)	267,471	90,954
Convertible preferred stock, $ 0.0001 par value per share, 0 and 1,043,778 shares authorized, issued and outstanding as of September 30, 2021, and December 31, 2020, respectively; aggregate liquidation preference of 0 and $1,921 as of September 30, 2021, and December 31, 2020, respectively;
NON-CURRENT LIABILITIES
Total mezzanine equity	0	1,921
Redeemable convertible preferred stock, $ 0.0001 par value per share, 0 and 15,968,831 shares authorized as of September 30, 2021, and December 31, 2020, respectively; 0 and 15,779,322 issued and outstanding as of September 30, 2021, and December 31, 2020, respectively; aggregate liquidation preference of 0 and $185,425 as of September 30, 2021, and December 31, 2020, respectively;
NON-CURRENT LIABILITIES
Total mezzanine equity	$ 0	$ 158,191