Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Summary of Employee and Nonemployee Stock Option Activity (Details)

v3.20.1
Stock-Based Compensation - Summary of Employee and Nonemployee Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Jan. 02, 2020
Mar. 31, 2020
Dec. 31, 2019
Options Outstanding, Number of Shares Outstanding      
Outstanding, beginning balance (in shares)   64,000  
Granted (in shares) 20,000    
Canceled or expired (in shares)   (11,000)  
Outstanding, ending balance (in shares)   73,000 64,000
Exercisable (in shares)   43,000  
Options Outstanding, Weighted-Average Exercise Price      
Outstanding, beginning balance (usd per share)   $ 113.63  
Granted (usd per share) $ 5.53    
Cancelled or expired (usd per share)   87.11  
Outstanding, ending balance (usd per share)   88.15 $ 113.63
Exercisable (usd per share)   $ 140.57  
Weighted-Average Remaining Contractual Term and Aggregate Intrinsic Value      
Weighted- average remaining contractual term, outstanding (in years)   7 years 11 months 5 days 7 years 5 months 23 days
Weighted- average remaining contractual term, exercisable (in years)   7 years 4 days  
Aggregate intrinsic value, outstanding   $ 0 $ 24
Aggregate intrinsic value, exercisable   $ 0