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Restatement of Consolidated Financial Statements - Consolidated Statement of Operations (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ 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
Revenue                              
Revenue $ 61,913 $ 56,915 $ 61,717 $ 65,777 $ 61,735 $ 59,187 $ 58,297 $ 48,384 $ 127,494 $ 184,409 $ 165,868   $ 246,322 $ 227,603 $ 231,201
Gross Profit 48,462 41,651 45,569 49,892 47,159 46,613 45,270 37,186 95,461 137,112 129,069   185,574 176,228 177,500
Operating expenses                              
Sales, general and administrative   20,182 21,721 23,306   26,521     45,027 65,209 76,835   86,441 100,551 98,254
Total operating expenses 59,466 54,151 56,657 59,354 57,760 67,698 82,316 68,595 116,011 170,162 218,609   229,628 276,369 264,467
Operating loss (11,004) (12,500) (11,088) (9,462) (10,601) (21,085) (37,046) (31,409) (20,550) (33,050) (89,540)   (44,054) (100,141) (86,967)
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 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)
Net loss per share:                              
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)
Weighted-average shares used in per share calculations:                              
Basic (in shares) 112,706 113,828 113,572 112,907 111,883 111,315 110,875 109,692 113,240 113,437 110,633   113,254 110,948 108,450
Diluted (in shares) 112,706 113,828 113,572 112,907 111,883 111,315 110,875 109,692 113,240 113,437 110,633   113,254 110,948 108,450
As originally reported                              
Revenue                              
Revenue     $ 59,930 $ 63,989   $ 57,399     $ 123,919 $ 180,834 $ 164,080   $ 242,747 $ 224,027  
Gross Profit     43,782 48,104   44,825     91,886 133,537 127,281   181,999 172,652  
Operating expenses                              
Sales, general and administrative     21,310 22,895         44,205 64,387     85,619 101,373  
Total operating expenses     56,246 58,943         115,189 169,340     228,806 277,191  
Operating loss     (12,464) (10,839)   (22,873)     (23,303) (35,803) (91,328)   (46,807) (104,539)  
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 loss   $ (12,779) $ (10,781) $ (7,983)   $ (17,331)     $ (18,764) $ (31,543) $ (80,887)   $ (43,609) $ (90,419)  
Net loss per share:                              
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                              
Revenue                              
Revenue     $ 1,787 $ 1,788   $ 1,788     $ 3,575 $ 3,575 $ 1,788   $ 3,575 $ 3,576  
Gross Profit     1,787 1,788   1,788     3,575 3,575 1,788   3,575 3,576  
Operating expenses                              
Sales, general and administrative     411 411         822 822     822 (822)  
Total operating expenses     411 411         822 822     822 (822)  
Operating loss     1,376 1,377   1,788     2,753 2,753 1,788   2,753 4,398  
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 loss   $ 42 $ 1,641 $ 1,444   $ 1,799     $ 3,085 $ 3,127 $ 1,799   $ 3,138 $ 4,455  
Net loss per share:                              
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  
Royalties                              
Revenue                              
Revenue   $ 16,602 $ 18,744 $ 21,482   $ 21,236     $ 40,226 $ 56,828 $ 73,139   $ 84,560 $ 94,361 $ 130,452
Royalties | As originally reported                              
Revenue                              
Revenue     16,957 19,694   19,448     36,651 53,253 71,351   80,985 90,785  
Royalties | Adjustments                              
Revenue                              
Revenue     $ 1,787 $ 1,788   $ 1,788     $ 3,575 $ 3,575 $ 1,788   $ 3,575 $ 3,576