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Summary of Significant Accounting Policies - Net Loss per Common Share and Stock-Based Compensation (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Dec. 09, 2016
shares
Jun. 30, 2017
item
$ / shares
shares
Feb. 28, 2017
item
$ / shares
shares
Aug. 31, 2016
item
$ / shares
shares
Jun. 30, 2018
USD ($)
item
$ / shares
shares
Jun. 30, 2017
USD ($)
item
$ / shares
shares
Jun. 30, 2018
USD ($)
employee
item
$ / shares
shares
Jun. 30, 2017
USD ($)
item
$ / shares
shares
Computation of Net Loss per Common Share                
Options outstanding to purchase common stock and unvested restricted stock at end of period (in shares)         17,776,000 15,588,000 17,776,000 15,588,000
Common stock equivalents under treasury stock method for options and unvested restricted stock (in shares)         3,451,000 1,224,000 3,484,000 463,000
Shares issuable upon conversion of convertible notes at end of period (in shares) | item         501 23,878 501 23,878
Common stock equivalents under if-converted method for convertible notes (in shares)         501,000 23,878,000 501,000 23,878,000
Additional disclosure for options                
Cash received for exercise of stock options | $             $ 2,819,000 $ 32,000
Estimated fair value of unvested employee awards, net of estimated forfeitures | $         $ 35,300,000   $ 35,300,000  
Weighted average vesting period of unvested employee awards             2 years 6 months  
Stock options                
Weighted-average assumptions used to estimate the fair value of each stock option                
Dividend (as a percent)         0.00% 0.00% 0.00% 0.00%
Volatility (as a percent)         71.60% 68.17% 70.90% 67.10%
Risk-free interest rate (as a percent)         2.84% 1.90% 2.71% 2.01%
Expected life         6 years 6 years 6 years 6 years
Weighted-average grant date fair value (in dollars per share) | $ / shares         $ 6.82 $ 2.86 $ 6.80 $ 1.75
Number of Stock Options                
Outstanding at the beginning of the period (in shares)             11,971,000  
Granted (in shares)             4,925,000  
Exercised (in shares)             (568,000)  
Forfeited/Canceled (in shares)             (368,000)  
Outstanding at the end of the period (in shares)         15,960,000   15,960,000  
Weighted-Average Exercise Price                
Outstanding at the beginning of the period (in dollars per share) | $ / shares             $ 9.92  
Granted (in dollars per share) | $ / shares             10.54  
Exercised (in dollars per share) | $ / shares             4.97  
Forfeited/Canceled (in dollars per share) | $ / shares             12.65  
Outstanding at the end of the period (in dollars per share) | $ / shares         $ 10.22   $ 10.22  
Additional disclosure for options                
Cash received for exercise of stock options | $             $ 2,800,000  
Stock options | Minimum                
Weighted-Average Exercise Price                
Exercised (in dollars per share) | $ / shares             $ 2.03  
Stock options | Maximum                
Weighted-Average Exercise Price                
Exercised (in dollars per share) | $ / shares             $ 12.21  
Restricted stock                
Stock-Based Compensation                
Exercise period   5 years 5 years 5 years        
Number of equal installments restrictions lapse | item   3 3 3        
Number of Restricted Stock                
Unvested at the beginning of the period (in shares)             2,319,000  
Vested (in shares)             (503,000)  
Unvested at the end of the period (in shares)         1,816,000   1,816,000  
Weighted-Average Grant Date Fair Value                
Unvested at the beginning of the period (in dollars per share) | $ / shares             $ 2.82  
Vested (in dollars per share) | $ / shares             2.64  
Unvested at the end of the period (in dollars per share) | $ / shares         $ 2.87   $ 2.87  
Additional disclosure for options                
Stock compensation expense (reduction) | $         $ 4,000,000 $ 3,100,000 $ 7,700,000 $ 5,700,000
Restricted stock | Officers                
Number of Restricted Stock                
Awarded (in shares)   239,000 529,830 117,800        
Weighted-Average Grant Date Fair Value                
Awarded (in dollars per share) | $ / shares   $ 4.71 $ 2.47 $ 3.15        
Additional disclosure for options                
Stock compensation expense (reduction) | $             $ 0  
2016 Plan                
Computation of Net Loss per Common Share                
Common stock equivalents under treasury stock method for options and unvested restricted stock (in shares) 19,500,000              
Stock-Based Compensation                
Number of employee share-based compensation plans | employee             1  
Common stock authorized for issuance (in shares) 7,500,000              
2016 Plan | Stock options                
Weighted-average assumptions used to estimate the fair value of each stock option                
Number of group of awards for which expected term is calculated for and applied | item             1  
2016 Plan | Stock options | Maximum                
Stock-Based Compensation                
Vesting period             4 years  
Exercise period             10 years