Earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2017 |
Sep. 30, 2017 |
Jun. 30, 2017 |
Mar. 31, 2017 |
Dec. 31, 2016 |
Sep. 30, 2016 |
Jun. 30, 2016 |
Mar. 31, 2016 |
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
Numerator | |||||||||||
Net loss | $ 1,270 | $ (33,738) | $ (17,475) | $ (29,057) | $ (26,796) | $ (35,167) | $ (38,914) | $ (41,233) | $ (79,000) | $ (142,110) | $ (170,447) |
Denominator | |||||||||||
Denominator for basic and diluted net loss per share (in shares) | 39,183,073 | 34,044,584 | 33,626,248 | ||||||||
Net loss per share: | |||||||||||
Basic and diluted (in dollars per share) | $ 0.03 | $ (0.82) | $ (0.44) | $ (0.85) | $ (0.78) | $ (1.03) | $ (1.14) | $ (1.22) | $ (2.02) | $ (4.17) | $ (5.07) |
Total shares excluded from calculation (in shares) | 6,841,653 | 6,125,967 | 5,170,812 | ||||||||
Stock Options | |||||||||||
Net loss per share: | |||||||||||
Total shares excluded from calculation (in shares) | 6,448,642 | 5,854,316 | 4,826,477 | ||||||||
Unvested restricted stock | |||||||||||
Net loss per share: | |||||||||||
Total shares excluded from calculation (in shares) | 393,011 | 271,651 | 344,335 |