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Stockholders' Equity - Narrative (Details)
1 Months Ended 12 Months Ended
Sep. 16, 2015
USD ($)
Sep. 11, 2015
$ / shares
shares
Aug. 06, 2014
$ / shares
shares
Sep. 30, 2013
shares
Dec. 31, 2017
USD ($)
plan
$ / shares
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
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     $ 2.45          
Proceeds from issuances of common stock, net | $ $ 23,600,000       $ 0 $ 0 $ 23,574,000      
Number of shares     47,000              
Warrant issuance of common stock sold     4.00%              
Exercise price (in dollars per share) | $ / shares     $ 5.40              
Percentage of public offering price     120.00%              
Number of additional other equity-based plans | plan         2          
Vesting period         10 years          
Unamortized stock compensation expense | $         $ 700,000 $ 1,219,000        
Remaining weighted average life         1 year 9 months 15 days 1 year 9 months 15 days        
Intrinsic value of options exercised | $         $ 42,000          
Intrinsic value of options outstanding | $         0          
Intrinsic value of options exercisable | $         $ 150.00          
2013 Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares authorized       500,000            
Number of shares available for grant (in shares)         427,437          
Purchase price of common stock, percent       85.00%            
Shares issued in the period (in shares)         16,004.000 22,094 18,119      
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               1,300,000 600,000 600,000
Vesting periods         10 years          
Number of shares available for grant (in shares)         1,798,693          
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