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Acquisition Accounting (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Jan. 04, 2018
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Estimated Fair Values of Assets Acquired and Liabilities Assumed [Abstract]        
Goodwill   $ 30,815   $ 0
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]        
Share-based compensation expense   5,382 $ 99  
Inotek [Member]        
Acquisition-date Fair Value of Consideration Transferred [Abstract]        
Number of shares issuable - consideration transferred (in shares) 7,077,326      
Price per share of Inotek common stock on acquisition date (in dollars per share) $ 12.16      
Total purchase price $ 86,060      
Estimated Fair Values of Assets Acquired and Liabilities Assumed [Abstract]        
Cash and cash equivalents 76,348      
Short-term investments 21,292      
Prepaid expense and other assets 1,041      
Property and equipment 256      
Deposits 168      
Goodwill 30,815      
Accounts payable and accrued expenses (4,961)      
Convertible notes (38,388)      
Unfavorable lease liability (511)      
Net assets acquired $ 86,060      
Acquisition costs incurred   132    
Supplemental Unaudited Pro Forma Information [Abstract]        
Revenue   0 0  
Net loss   (15,998) $ (15,670)  
Inotek [Member] | Restricted Stock Units [Member]        
Acquisition-date Fair Value of Consideration Transferred [Abstract]        
Number of shares issuable - consideration transferred (in shares) 271,718      
Inotek [Member] | Common Stock [Member]        
Acquisition-date Fair Value of Consideration Transferred [Abstract]        
Number of shares issuable - consideration transferred (in shares) 6,805,608      
Inotek [Member] | Acquisition-related Costs [Member]        
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]        
Transaction costs   4,512    
Share-based compensation expense   3,459    
Severance and stay bonuses expenses   $ 1,622