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Selected Quarterly Financial Data (Unaudited) - Schedule of Error Corrections and Prior Period Adjustments (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Revenues $ 17,071 $ 6,966 $ 13,798 $ 25,374 $ 33,966 $ 27,674 $ 12,087 $ 17,962 $ 63,209 $ 91,689 $ 79,256
Loss from operations (12,367) (22,927) (30,272) (37,713) (29,016) (28,605) (33,491) (39,512) (103,279) (130,624) (127,171)
Net loss $ (16,781) $ (27,396) $ (34,549) $ (41,822) $ (26,609) $ (29,809) $ (34,657) $ (31,918) $ (120,548) $ (122,993) $ (131,445)
Net loss per common share, basic and diluted (usd per share) $ (0.16) $ (0.26) $ (0.33) $ (0.40) $ (0.25) $ (0.28) $ (0.33) $ (0.31) $ (1.14) $ (1.17) $ (1.27)
Shares used in computing net loss per common share, basic and diluted 105,920 105,881 105,848 105,668 105,588 105,582 105,300 104,461 105,830 105,237 103,863
Previously reported                      
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Revenues   $ 6,856 $ 13,753 $ 25,207 $ 33,047 $ 26,942 $ 12,053 $ 18,293   $ 90,335 $ 83,337
Loss from operations   (23,043) (30,429) (37,966) (30,785) (29,518) (33,893) (42,485)   (136,681) (137,155)
Net loss   $ (27,512) $ (34,706) $ (42,075) $ (28,378) $ (30,722) $ (35,059) $ (34,891)   $ (129,050) $ (141,429)
Net loss per common share, basic and diluted (usd per share)   $ (0.26) $ (0.33) $ (0.40) $ (0.27) $ (0.29) $ (0.33) $ (0.33)   $ (1.23) $ (1.36)
Shares used in computing net loss per common share, basic and diluted   105,881 105,848 105,668 105,588 105,582 105,300 104,461   105,237 103,863
Adjustments                      
Error Corrections and Prior Period Adjustments Restatement [Line Items]                      
Revenues   $ 110 $ 45 $ 167 $ 919 $ 732 $ 34 $ (331)   $ 1,354 $ (4,081)
Loss from operations   116 157 253 1,769 913 402 2,973   6,057 9,984
Net loss   $ 116 $ 157 $ 253 $ 1,769 $ 913 $ 402 $ 2,973   $ 6,057 $ 9,984
Net loss per common share, basic and diluted (usd per share)   $ 0.00 $ 0.00 $ 0.00 $ 0.02 $ 0.01 $ 0.00 $ 0.02   $ 0.06 $ 0.09
Shares used in computing net loss per common share, basic and diluted