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Stock-Based Compensation - Summary of Option Activity under 2010 Plan and 2019 Plan (Details) - 2010 Plan and 2019 Plan
shares in Thousands
Jun. 30, 2020
$ / shares
shares
Shares Available for Grant  
Balance at the beginning of the year (in shares) 88
Balance at the end of the period (in shares) 88
Number of Shares  
Balance at the beginning of the year (in shares) 161
Balance at the end of the period (in shares) 161
Weighted Average Exercise Prices  
Weighted-average exercise price (in dollars per share) | $ / shares $ 10.85
Weighted-average exercise price (in dollars per share) | $ / shares $ 10.85