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Stock-based Compensation - 2014 Equity Incentive Plan and Stock Option Grants (Details) - shares
3 Months Ended 9 Months Ended
May 02, 2014
Sep. 30, 2016
Sep. 30, 2016
Jan. 01, 2016
Dec. 31, 2015
Jan. 01, 2015
2014 Equity Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock outstanding percentage 4.00%          
Number of shares of common stock for future issuance, board of directors prerogative, increase in period (in shares) 0          
Possible future issuance under equity compensation plan (in shares)   672,782 672,782 556,223 552,415 340,484
Options granted in period (in shares)   47,026 487,946      
2014 Equity Incentive Plan [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Base number of new shares available for future issuance under equity incentive plan (in shares) 1,122,731          
Common stock issuable period 10 years          
2009 Stock Option Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of additional awards expected to be granted (in shares) 0