Consolidated Statements of Changes in Stockholders'/Members Equity - USD ($)
$ in Thousands
Total
Membership Units
Common Stock
Additional Paid in Capital
Accumulated Other Comprehensive Loss
Accumulated Net Investment Gain (Loss) Attributable to Parent
Accumulated Deficit
Balance at beginning of period at Dec. 31, 2013 $ (15,737)         $ 160,778 $ (176,515)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net loss (5,455)           (5,455)
Investment by Ikaria, Inc., net prior to Spin-Out 7,547         7,547  
Additional investment by Ikaria, Inc. for settlement of liabilities prior to Spin-Out 9,196         9,196  
Balance at end of period at Feb. 11, 2014 (4,449)         177,521 (181,970)
Balance at beginning of period at Dec. 31, 2013 (15,737)         160,778 (176,515)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net loss (59,674)            
Balance at end of period (in shares) at Dec. 31, 2014   7,905,325          
Balance at end of period at Dec. 31, 2014 22,937 $ 77,156         (54,219)
Balance at beginning of period at Feb. 11, 2014 (4,449)         177,521 (181,970)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net loss (54,219)           (54,219)
Spinoff transaction 80,000 $ 75,551       $ (177,521) 181,970
Spinoff transaction (in shares)   7,899,251          
Stock-based compensation 1,568 $ 1,568          
Exercise of options (in shares)   8,182          
Exercise of options 66 $ 66          
Stock repurchased during period, shares (in shares)   (2,108)          
Stock repurchased during period, value (29) $ (29)          
Balance at end of period (in shares) at Dec. 31, 2014   7,905,325          
Balance at end of period at Dec. 31, 2014 22,937 $ 77,156         (54,219)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net loss (46,459)            
Stock-based compensation 1,751   $ 1 $ 1,750      
Exercise of options (in shares)     126,499        
Exercise of options 186   $ 1 185      
Other comprehensive income (19)       $ (19)    
Sale of membership units 1 $ 1          
Sale of membership units (in units)   67          
Conversion of membership units into common stock in connection with conversion of LLC into a C-Corp. (in shares)   (7,905,392) 7,905,392        
Conversion of membership units into common stock in connection with conversion of LLC into a C-Corp.   $ (77,157) $ 79 77,078      
Sale of common stock in initial public offering ($12.00 per share), net of underwriting discounts and commissions and offering expenses of $8,085) (in shares)     5,000,000        
Sale of common stock in initial public offering ($12.00 per share), net of underwriting discounts and commissions and offering expenses of $8,085) 51,915   $ 50 51,865      
Stock issued during period, shares, issued for services     8,000        
Stock issued during period, value, issued for services 24   $ 0 24      
Stock-based compensation (in shares)     90,909        
Balance at end of period (in shares) at Dec. 31, 2015     13,130,800        
Balance at end of period at Dec. 31, 2015 $ 30,336   $ 131 $ 130,902 $ (19)   $ (100,678)