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Stockholders' Equity - Narrative (Details)
1 Months Ended 12 Months Ended
Sep. 16, 2015
USD ($)
Sep. 11, 2015
$ / shares
shares
Sep. 30, 2013
shares
Dec. 31, 2018
USD ($)
plan
$ / shares
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
shares
Dec. 31, 2015
Jun. 21, 2017
shares
Jul. 22, 2015
shares
May 06, 2014
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Issuance of common stock (in shares)   1,500,000                
Share price (in dollars per share) | $ / shares   $ 17.00   $ 0.62            
Proceeds from issuances of common stock, net | $ $ 23,600,000                  
Number of additional other equity-based plans | plan       2            
Vesting period       10 years            
Unamortized stock compensation expense | $       $ 900,000 $ 700,000          
Remaining weighted average life       1 year 9 months 15 days 1 year 9 months 15 days          
Exercised (in shares)       0 42,000 79,166        
Intrinsic value of options outstanding | $       $ 0            
Intrinsic value of options exercisable | $         $ 0.00          
2013 Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares authorized (in shares)     500,000              
Number of shares available for grant (in shares)       401,484            
Purchase price of common stock, percent     85.00%              
Shares issued in the period (in shares)       25,953.000 16,004.000 22,094        
Restricted stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period       1 year            
Minimum | Restricted Stock Units (RSUs)                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting periods             1 year      
Minimum | Employee stock option                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period       1 year            
Maximum | Restricted Stock Units (RSUs)                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting periods             3 years      
Maximum | Employee stock option                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period       4 years            
2014 Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares authorized (in shares)               1,300,000 600,000 600,000
Number of shares available for grant (in shares)       1,269,815            
Vesting periods       10 years            
2014 Plan | Minimum                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period       3 years            
2014 Plan | Maximum                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period       4 years            
Shares sold by selling stockholders                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Issuance of common stock (in shares)   1,500,000