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Quarterly Financial Information (Unaudited) - Condensed Consolidated Statements of Operations and Comprehensive Loss (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]                              
Revenue $ 59,216 $ 71,757 $ 91,864 $ 108,200 $ 100,524 $ 88,562 $ 82,868 $ 67,377 $ 59,684 $ 58,614 $ 43,372 $ 269,709 $ 380,154 $ 229,047  
Costs and expenses:                              
Cost of revenue 7,599 9,003 9,200 8,422 8,179 4,386 4,256 3,475 3,102 2,937 2,767 30,718 25,243 12,281  
Research and development 7,937 18,253 18,650 15,744 13,066 10,140 7,282 9,972 4,369 4,518 4,366 52,265 46,232 23,225  
Sales and marketing 51,480 73,731 117,345 155,404 114,828 99,998 96,461 80,739 73,577 52,785 47,168 277,014 466,691 254,269  
General and administrative 20,936 26,881 92,723 34,248 48,514 25,601 27,439 18,006 7,905 11,686 4,865 163,018 135,802 42,462  
Impairment of goodwill and long-lived assets 51,230 0 0 0 0 0 0 0 0 0 0 168,051 0 0  
Total costs and expenses 139,182 127,868 237,918 213,818 184,587 140,125 135,438 112,192 88,953 71,926 59,166 691,066 673,968 332,237  
Loss from operations (79,966) (56,111) (146,054) (105,618) (84,063) (51,563) (52,570) (44,815) (29,269) (13,312) (15,794) (421,357) (293,814) (103,190)  
Interest expense, net (3,807) (7,596) (8,157) (1,086) (87) (25) (24) (28) (24) (957) (316) (23,992) (1,222) (1,325)  
Change in fair value of common stock warrant liabilities (80) 1,023 4,462 6,024 113,601 (29,595) (2,108) (23,049) 0 0 0 6,004 87,922 (23,049)  
Other income (expense), net 508 (82) (28) (59) (22) 80 50 (651) (14,216) (6,584) 51 125 49 (21,400)  
Loss before income taxes (83,345) (62,766) (149,777) (100,739) 29,429 (81,103) (54,652) (68,543) (43,509) (20,853) (16,059) (439,220) (207,065) (148,964)  
Benefit for income taxes 120 155 213 (314) (18,933) 65 42 15 47 28 25 (345) (19,140) 115  
Net loss $ (83,225) $ (62,611) $ (149,564) $ (100,425) $ 48,362 $ (81,168) $ (54,694) $ (68,558) $ (43,556) $ (20,881) $ (16,084) $ (438,875) $ (187,925) $ (149,079)  
Net loss per share attributable to common stockholders:                              
Basic (in dollars per share) $ (0.20) $ (0.16) $ (0.37) $ (0.25) $ 0.12 $ (0.21) $ (0.15) $ (0.23) $ (0.15) $ (0.07) $ (0.06) $ (1.07) $ (0.49) $ (0.51)  
Diluted (in dollars per share) $ (0.20) $ (0.16) $ (0.37) $ (0.25) $ (0.16) $ (0.21) $ (0.16) $ (0.23) $ (0.15) $ (0.07) $ (0.06) $ (1.07) $ (0.71) $ (0.51)  
Other comprehensive loss:                              
Change in unrealized loss on available-for-sale investments, net of tax $ 139 $ (577) $ (2,046) $ (248) $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ (1,315) $ (248) $ 0  
Total other comprehensive loss 139 (577) (2,046) (248) 0 0 0 0 0 0 0 (1,315) (248) 0  
Total comprehensive loss (83,086) (63,188) (151,610) (100,673) 48,362 (81,168) (54,694) (68,558) (43,556) (20,881) (16,084) (440,190) (188,173) (149,079)  
Impairment of goodwill and long-lived assets                       66,652      
Total current liabilities 71,054 75,587 87,824 99,816 81,369 46,200 38,955 55,349       49,495 99,816 55,349  
Total liabilities 357,801 371,080 395,661 411,965 90,279 135,603 49,193 233,627       342,894 411,965 233,627  
Additional paid-in capital 1,141,756 1,135,698 1,121,651 1,043,600 116,871 196,315 161,607         1,153,031 1,043,600    
Accumulated deficit (729,637) (646,409) (583,798) (434,233) (333,808) (382,171) (301,002) (246,308)       (873,108) (434,233) (246,308)  
Total stockholders' equity 409,428 486,459 535,599 609,159 691,249 524,143 579,816 48,794       $ 278,401 609,159 48,794 $ 14,241
As Reported                              
Error Corrections and Prior Period Adjustments Restatement [Line Items]                              
Revenue 60,255 73,335 93,438 108,849 102,072 89,491 83,677 67,723 59,955 58,878 43,559   384,089 230,115  
Costs and expenses:                              
Cost of revenue 7,555 9,020 9,265 8,422 7,647 4,386 4,256 3,475 3,102 2,937 2,767   24,711 12,281  
Research and development 8,354 18,529 18,653 15,433 13,162 10,140 7,282 9,972 4,369 4,518 4,366   46,017 23,225  
Sales and marketing 51,773 73,185 117,332 155,080 114,531 99,523 96,323 79,560 73,187 52,369 46,825   465,457 251,941  
General and administrative 20,280 26,712 92,792 33,934 48,376 25,432 27,284 17,953 7,861 11,642 4,833   135,026 42,289  
Total costs and expenses 135,543 127,446 238,042 212,869 183,716 139,481 135,145 110,960 88,519 71,466 58,791   671,211 329,736  
Loss from operations (75,288) (54,111) (144,604) (104,020) (81,644) (49,990) (51,468) (43,237) (28,564) (12,588) (15,232)   (287,122) (99,621)  
Interest expense, net (3,807) (7,596) (8,157) (1,086) (87) (25) (24) (28) (24) (957) (316)        
Change in fair value of common stock warrant liabilities (80) 1,023 4,462 6,024 113,601 (29,595) (2,108) (23,049) 0 0 0        
Other income (expense), net 508 (82) (27) (59) (22) 80 50 (651) (14,216) (6,584) 51        
Loss before income taxes (78,667) (60,766) (148,326) (99,141) 31,848 (79,530) (53,550) (66,965) (42,804) (20,129) (15,497)   (200,373) (145,395)  
Benefit for income taxes 120 155 213 (170) (18,933) 65 42 15 47 28 25   (18,996)    
Net loss $ (78,547) $ (60,611) $ (148,113) $ (98,971) $ 50,781 $ (79,595) $ (53,592) $ (66,980) $ (42,851) $ (20,157) $ (15,522)   $ (181,377) $ (145,510)  
Net loss per share attributable to common stockholders:                              
Basic (in dollars per share) $ (0.19) $ (0.15) $ (0.37) $ (0.25) $ 0.13 $ (0.21) $ (0.15) $ (0.22) $ (0.14) $ (0.07) $ (0.06)   $ (0.47) $ (0.49)  
Diluted (in dollars per share) $ (0.19) $ (0.15) $ (0.37) $ (0.25) $ (0.16) $ (0.21) $ (0.16) $ (0.22) $ (0.14) $ (0.07) $ (0.06)   $ (0.69) $ (0.49)  
Other comprehensive loss:                              
Change in unrealized loss on available-for-sale investments, net of tax $ 139 $ (577) $ (2,046) $ (248) $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0        
Total other comprehensive loss 139 (577) (2,046) (248) 0 0 0 0 0 0 0        
Total comprehensive loss (78,408) (61,188) (150,159) (99,219) 50,781 (79,595) (53,592) (66,980) (42,851) (20,157) (15,522)   $ (181,625) $ (145,510)  
Impairment of goodwill and long-lived assets 47,581 0 0 0 0 0 0 0 0 0 0        
Total current liabilities 53,222 58,379 72,917 86,832 70,157 35,531 29,860 47,356         86,832 47,356  
Total liabilities 340,113 354,016 380,898 399,125 80,204 124,934 40,098 225,634         399,125 225,634  
Additional paid-in capital 1,141,955 1,136,133 1,121,697   106,796 185,646 152,512                
Accumulated deficit (706,963) (628,416) (567,805) (419,692) (320,721) (371,502) (291,907) (238,315)         (419,692) (238,315)  
Total stockholders' equity 432,301 504,887 551,638 623,700 704,336 534,812 588,911 56,787         623,700 56,787  
Revision of Prior Period, Adjustment | End-User Liability                              
Error Corrections and Prior Period Adjustments Restatement [Line Items]                              
Revenue (71) (83) (52) (41) (34) (38) (25) (25) (19) (24) (17)   (138) (87)  
Costs and expenses:                              
Cost of revenue 0 0 0 0 0 0 0 0 0 0 0   0 0  
Research and development 0 0 0 0 0 0 0 0 0 0 0   0 0  
Sales and marketing (84) 1,053 630 531 636 475 138 1,179 390 416 343   1,780 2,328  
General and administrative 0 0 0 0 0 0 0 0 0 0 0   0 0  
Impairment of goodwill and long-lived assets 0 0 0 0 0 0 0 0 0 0 0        
Total costs and expenses (84) 1,053 630 531 636 475 138 1,179 390 416 343   1,780 2,328  
Loss from operations 13 (1,136) (682) (572) (670) (513) (163) (1,204) (409) (440) (360)   (1,918) (2,415)  
Interest expense, net 0 0 0 0 0 0 0 0 0 0 0        
Change in fair value of common stock warrant liabilities 0 0 0 0 0 0 0 0 0 0 0        
Other income (expense), net 0 0 0 0 0 0 0 0 0 0 0        
Loss before income taxes 13 (1,136) (682) (572) (670) (513) (163) (1,204) (409) (440) (360)   (1,918) (2,415)  
Benefit for income taxes 0 0 0 0 0 0 0 0 0 0 0   0    
Net loss $ 13 $ (1,136) $ (682) $ (572) $ (670) $ (513) $ (163) $ (1,204) $ (409) $ (440) $ (360)   $ (1,918) $ (2,415)  
Net loss per share attributable to common stockholders:                              
Basic (in dollars per share) $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0   $ 0 $ (0.01)  
Diluted (in dollars per share) $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0   $ 0 $ (0.01)  
Other comprehensive loss:                              
Change in unrealized loss on available-for-sale investments, net of tax $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0        
Total other comprehensive loss 0 0 0 0 0 0 0 0 0 0 0        
Total comprehensive loss 13 (1,136) (682) (572) (670) (513) (163) (1,204) (409) (440) (360)   $ (1,918) $ (2,415)  
Total current liabilities 9,972 9,985 8,849 8,168 7,596 6,926 6,413 6,250         8,168 6,250  
Total liabilities 9,972 9,985 8,849 8,168 7,596 6,926 6,413 6,250         8,168 6,250  
Additional paid-in capital 0 0 0   7,596 6,926 6,413                
Accumulated deficit (9,972) (9,985) (8,849) (8,168) (7,596) (6,926) (6,413) (6,250)         (8,168) (6,250)  
Total stockholders' equity (9,972) (9,985) (8,849) (8,168) (7,596) (6,926) (6,413) (6,250)         (8,168) (6,250)  
Revision of Prior Period, Adjustment | Indirect Taxes                              
Error Corrections and Prior Period Adjustments Restatement [Line Items]                              
Revenue (856) (1,470) (1,435) (1,114) (1,008) (891) (784) (321) (252) (240) (170)   (3,797) (981)  
Costs and expenses:                              
Cost of revenue 0 0 0 0 0 0 0 0 0 0 0   0 0  
Research and development 0 0 0 0 0 0 0 0 0 0 0   0 0  
Sales and marketing 0 0 0 0 0 0 0 0 0 0 0   0 0  
General and administrative 152 184 (76) 192 176 169 155 53 44 44 32   691 173  
Impairment of goodwill and long-lived assets 0 0 0 0 0 0 0 0 0 0 0        
Total costs and expenses 152 184 (76) 192 176 169 155 53 44 44 32   691 173  
Loss from operations (1,008) (1,654) (1,359) (1,306) (1,184) (1,060) (939) (374) (296) (284) (202)   (4,488) (1,154)  
Interest expense, net 0 0 0 0 0 0 0 0 0 0 0        
Change in fair value of common stock warrant liabilities 0 0 0 0 0 0 0 0 0 0 0        
Other income (expense), net 0 0 0 0 0 0 0 0 0 0 0        
Loss before income taxes (1,008) (1,654) (1,359) (1,306) (1,184) (1,060) (939) (374) (296) (284) (202)   (4,488) (1,154)  
Benefit for income taxes 0 0 0 0 0 0 0 0 0 0 0   0    
Net loss $ (1,008) $ (1,654) $ (1,359) $ (1,306) $ (1,184) $ (1,060) $ (939) $ (374) $ (296) $ (284) $ (202)   $ (4,488) $ (1,154)  
Net loss per share attributable to common stockholders:                              
Basic (in dollars per share) $ 0 $ 0 $ 0 $ 0 $ (0.01) $ 0 $ 0 $ 0 $ 0 $ 0 $ 0   $ (0.01) $ 0  
Diluted (in dollars per share) $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0   $ (0.01) $ 0  
Other comprehensive loss:                              
Change in unrealized loss on available-for-sale investments, net of tax $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0        
Total other comprehensive loss 0 0 0 0 0 0 0 0 0 0 0        
Total comprehensive loss (1,008) (1,654) (1,359) (1,306) (1,184) (1,060) (939) (374) (296) (284) (202)   $ (4,488) $ (1,154)  
Total current liabilities 10,254 9,246 7,591 6,232 4,926 3,743 2,682 1,744         6,232 1,744  
Total liabilities 10,254 9,246 7,591 6,232 4,926 3,743 2,682 1,744         6,232 1,744  
Additional paid-in capital 0 0 0   4,926 3,743 2,682                
Accumulated deficit (10,254) (9,246) (7,591) (6,232) (4,926) (3,743) (2,682) (1,744)         (6,232) (1,744)  
Total stockholders' equity (10,254) (9,246) (7,591) (6,232) (4,926) (3,743) (2,682) (1,744)         (6,232) (1,744)  
Revision of Prior Period, Adjustment | Impairment                              
Error Corrections and Prior Period Adjustments Restatement [Line Items]                              
Revenue 0 0 0 0 0 0 0 0 0 0 0        
Costs and expenses:                              
Cost of revenue (245) 0 0 0 0 0 0 0 0 0 0        
Research and development 0 0 0 0 0 0 0 0 0 0 0        
Sales and marketing (2) 0 0 0 0 0 0 0 0 0 0        
General and administrative (21) 0 0 0 0 0 0 0 0 0 0        
Total costs and expenses 3,381 0 0 0 0 0 0 0 0 0 0        
Loss from operations (3,381) 0 0 0 0 0 0 0 0 0 0        
Interest expense, net 0 0 0 0 0 0 0 0 0 0 0        
Change in fair value of common stock warrant liabilities 0 0 0 0 0 0 0 0 0 0 0        
Other income (expense), net 0 0 0 0 0 0 0 0 0 0 0        
Loss before income taxes (3,381) 0 0 0 0 0 0 0 0 0 0        
Benefit for income taxes 0 0 0 0 0 0 0 0 0 0 0        
Net loss $ (3,381) $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0        
Net loss per share attributable to common stockholders:                              
Basic (in dollars per share) $ (0.01) $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0        
Diluted (in dollars per share) $ (0.01) $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0        
Other comprehensive loss:                              
Change in unrealized loss on available-for-sale investments, net of tax $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0        
Total other comprehensive loss 0 0 0 0 0 0 0 0 0 0 0        
Total comprehensive loss (3,381) 0 0 0 0 0 0 0 0 0 0        
Impairment of goodwill and long-lived assets 3,649 0 0 0 0 0 0 0 0 0 0        
Total current liabilities 0 0 0   0 0 0                
Total liabilities 0 0 0   0 0 0                
Additional paid-in capital 0 0 0   0 0 0                
Accumulated deficit (3,383) 0 0   0 0 0                
Total stockholders' equity (3,383) 0 0   0 0 0                
Revision of Prior Period, Adjustment | Other Adjustments                              
Error Corrections and Prior Period Adjustments Restatement [Line Items]                              
Revenue (112) (25) (87) 506 (506) 0 0 0 0 0 0   0 0  
Costs and expenses:                              
Cost of revenue 289 (17) (65) 0 532 0 0 0 0 0 0   532 0  
Research and development (417) (276) (3) 311 (96) 0 0 0 0 0 0   215 0  
Sales and marketing (207) (507) (617) (207) (339) 0 0 0 0 0 0   (546) 0  
General and administrative 525 (15) 7 122 (38) 0 0 0 0 0 0   85 0  
Impairment of goodwill and long-lived assets 0 0 0 0 0 0 0 0 0 0 0        
Total costs and expenses 190 (815) (678) 226 59 0 0 0 0 0 0   286 0  
Loss from operations (302) 790 591 280 (565) 0 0 0 0 0 0   (286) 0  
Interest expense, net 0 0 0 0 0 0 0 0 0 0 0        
Change in fair value of common stock warrant liabilities 0 0 0 0 0 0 0 0 0 0 0        
Other income (expense), net 0 0 (1) 0 0 0 0 0 0 0 0        
Loss before income taxes (302) 790 590 280 (565) 0 0 0 0 0 0   (286) 0  
Benefit for income taxes 0 0 0 (144) 0 0 0 0 0 0 0   (144)    
Net loss $ (302) $ 790 $ 590 $ 424 $ (565) $ 0 $ 0 $ 0 $ 0 $ 0 $ 0   $ (142) $ 0  
Net loss per share attributable to common stockholders:                              
Basic (in dollars per share) $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0   $ 0 $ 0  
Diluted (in dollars per share) $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0   $ 0 $ 0  
Other comprehensive loss:                              
Change in unrealized loss on available-for-sale investments, net of tax $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0 $ 0        
Total other comprehensive loss 0 0 0 0 0 0 0 0 0 0 0        
Total comprehensive loss (302) 790 590 424 (565) 0 0 0 $ 0 $ 0 $ 0   $ (142) $ 0  
Total current liabilities (2,394) (2,023) (1,533) (1,416) (1,310) 0 0 (1)         (1,416) (1)  
Total liabilities (2,538) (2,167) (1,677) (1,560) (2,447) 0 0 (1)         (1,560) (1)  
Additional paid-in capital (199) (435) (46)   (2,447) 0 0                
Accumulated deficit 935 1,238 447 (141) (565) 0 0 1         (141) 1  
Total stockholders' equity $ 736 $ 803 $ 401 $ (141) $ (565) $ 0 $ 0 $ 1         $ (141) $ 1