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STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Non-Redeemable Preferred Stock
Class C
Non-Redeemable Preferred Stock
Class B (Series B-II)
Non-Redeemable Preferred Stock
Class B (Series B-I)
Non-Redeemable Preferred Stock
Class A
Non-Redeemable Preferred Stock
Series C
Non-Redeemable Preferred Stock
Series B-2
Non-Redeemable Preferred Stock
Series B-1
Non-Redeemable Preferred Stock
Series A
Common Units
Common Stock
Additional Paid-in-Capital
Accumulated Deficit
Beginning balance (in shares) at Dec. 31, 2014   5,911,450 2,827,848 4,937,818 22,924,210         0      
Beginning balance at Dec. 31, 2014 $ 11,397 $ 13,479 $ 3,641 $ 5,371 $ 135         $ 0   $ 120 $ (11,349)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Exercise of options (in shares) | Scenario, Previously Reported 166,875                        
Net loss $ (13,151)                        
Ending balance (in shares) at Dec. 31, 2015           14,464,445 2,827,844 4,937,813 22,924,209   166,875    
Ending balance at Dec. 31, 2015 $ 18,230         $ 33,039 $ 3,641 $ 5,371 $ 135   $ 0 (18,293) (5,663)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Exercise of options (in shares) | Scenario, Previously Reported 98,283                        
Exercise of options (in shares)                     98,283    
Exercise of options $ 33                     33  
Equity-based compensation 682                     682  
Issuance of stock, net (in shares)           195,651              
Issuance of stock, net 444         $ 444              
Net loss (16,941)                       (16,941)
Ending balance (in shares) (Scenario, Previously Reported) at Dec. 31, 2016           14,660,096 2,827,844 4,937,813 22,924,209   265,158    
Ending balance (in shares) at Dec. 31, 2016           11,239,359 1,403,984 2,451,560 11,381,640   131,644    
Ending balance at Dec. 31, 2016 $ 2,448         $ 33,483 $ 3,641 $ 5,371 $ 135   $ 0 (17,578) (22,604)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Exercise of options (in shares) 58,440                   58,440    
Exercise of options $ 43                     43  
Equity-based compensation 1,104                     1,104  
Share conversion in connection with the Merger (in shares)           (11,239,359) (1,403,984) (2,451,560) (11,381,640)   28,556,543    
Share conversion in connection with the Merger (31)         $ (33,483) $ (3,641) $ (5,371) $ (135)   $ 3 42,596  
Issuance of stock, net (in shares)                     6,767,360    
Issuance of stock, net 17,055                   $ 1 17,054  
Net loss (8,937)                       (8,937)
Ending balance (in shares) at Sep. 30, 2017           0 0 0 0   35,513,987    
Ending balance at Sep. 30, 2017 $ 11,682         $ 0 $ 0 $ 0 $ 0   $ 4 $ 43,219 $ (31,541)