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Restatement and Revision of Quarterly Condensed Consolidated Financial Statements - Consolidated Statements of Operations Adjustments (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating expenses                              
Interest income and other income (expense), net   $ 3,554 $ 4,688 $ 6,443   $ 6,751     $ 11,131 $ 14,685 $ 21,136   $ 17,855 $ 27,445 $ 32,621
Interest and other income (expense), net   968 2,108 3,888   4,254     5,996 6,964 13,834   7,515 17,593 16,339
Loss before income taxes   (11,532) (8,980) (5,574)   (16,831)     (14,554) (26,086) (75,706)   (36,539) (82,548) (70,628)
Provision for income taxes   1,205 160 965   (1,299)     1,125 2,330 3,382   3,932 3,416 87,329
Net income (loss) $ (12,055) $ (12,737) $ (9,140) $ (6,539) $ (6,876) $ (15,532) $ (36,980) $ (26,576) $ (15,679) $ (28,416) $ (79,088) $ (155,939) $ (40,471) $ (85,964) $ (157,957)
Basic (in dollars per share) $ (0.11) $ (0.11) $ (0.08) $ (0.06) $ (0.06) $ (0.14) $ (0.33) $ (0.24) $ (0.14) $ (0.25) $ (0.71)   $ (0.36) $ (0.77) $ (1.46)
Diluted (in dollars per share) $ (0.11) $ (0.11) $ (0.08) $ (0.06) $ (0.06) $ (0.14) $ (0.33) $ (0.24) $ (0.14) $ (0.25) $ (0.71)   $ (0.36) $ (0.77) $ (1.46)
As originally reported                              
Operating expenses                              
Interest income and other income (expense), net   $ 3,464 $ 4,597 $ 6,374   $ 6,727     $ 10,971 $ 14,435 $ 21,112   $ 17,516 $ 27,375  
Interest and other income (expense), net   878 2,017 3,819   4,230     5,836 6,714 13,810   7,176 17,523  
Loss before income taxes   (11,622) (10,447) (7,020)   (18,643)     (17,467) (29,089) (77,518)   (39,631) (87,016)  
Provision for income taxes   1,157 334 963   (1,312)     1,297 2,454 3,369   3,978 3,403  
Net income (loss)   $ (12,779) $ (10,781) $ (7,983)   $ (17,331)     $ (18,764) $ (31,543) $ (80,887)   $ (43,609) $ (90,419)  
Basic (in dollars per share)   $ (0.11) $ (0.09) $ (0.07)   $ (0.16)     $ (0.17) $ (0.28) $ (0.73)   $ (0.39) $ (0.81)  
Diluted (in dollars per share)   $ (0.11) $ (0.09) $ (0.07)   $ (0.16)     $ (0.17) $ (0.28) $ (0.73)   $ (0.39) $ (0.81)  
Adjustments                              
Operating expenses                              
Interest income and other income (expense), net   $ 90 $ 91 $ 69   $ 24     $ 160 $ 250 $ 24   $ 339 $ 70  
Interest and other income (expense), net   90 91 69   24     160 250 24   339 70  
Loss before income taxes   90 1,467 1,446   1,812     2,913 3,003 1,812   3,092 4,468  
Provision for income taxes   48 (174) 2   13     (172) (124) 13   (46) 13  
Net income (loss)   $ 42 $ 1,641 $ 1,444   $ 1,799     $ 3,085 $ 3,127 $ 1,799   $ 3,138 $ 4,455  
Basic (in dollars per share)   $ 0 $ 0.01 $ 0.01   $ 0.02     $ 0.03 $ 0.03 $ 0.02   $ 0.03 $ 0.04  
Diluted (in dollars per share)   $ 0 $ 0.01 $ 0.01   $ 0.02     $ 0.03 $ 0.03 $ 0.02   $ 0.03 $ 0.04