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The Company and Basis of Presentation - Liquidity (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Nov. 06, 2019
Jun. 21, 2019
Sep. 28, 2018
May 31, 2018
Sep. 29, 2019
Jun. 30, 2019
Sep. 29, 2019
Sep. 30, 2018
Dec. 30, 2018
Liquidity [Line Items]                  
Cash, cash equivalents and restricted cash         $ 24,800   $ 24,800    
Revolving line of credit         $ 15,000   $ 15,000   $ 15,000
Common stock, par value (in dollars per share)   $ 0.001     $ 0.001   $ 0.001   $ 0.001
Shares issued price per share (in dollars per share)   $ 0.50              
Net proceeds from issuance of common stock       $ 13,900 $ 8,000 $ 8,000 $ 9,439 $ 15,859  
Heritage Bank | Revolving Line of Credit                  
Liquidity [Line Items]                  
Revolving line of credit         $ 15,000   $ 15,000   $ 15,000
Line of credit interest rate     0.50%   0.50%   0.50%    
Heritage Bank | Revolving Line of Credit | Subsequent Event                  
Liquidity [Line Items]                  
Line of credit facility, maturity date Sep. 28, 2021                
Line of credit facility, expiration period 1 year                
Line of credit interest rate 0.50%                
Line of credit interest rate, one 5.50%                
Common stock                  
Liquidity [Line Items]                  
Aggregate shares of common stock issued       13.5          
Exercise of Option for Overallotment of Shares by Underwriters | Common stock                  
Liquidity [Line Items]                  
Aggregate shares of common stock issued   2.4              
Underwritten Public Offering | Common stock                  
Liquidity [Line Items]                  
Aggregate shares of common stock issued   18.4