Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Summary of RSU Activity (Detail)

v3.19.3
Stockholders' Equity - Summary of RSU Activity (Detail) - Restricted Stock Units (RSUs) [Member]
shares in Thousands
9 Months Ended
Sep. 30, 2019
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Total RSUs, Beginning balance | shares 0
Total RSUs, Granted | shares 1,600
Total RSUs, Vested | shares 0
Total RSUs, Forfeited/cancelled/expired | shares (60)
Total RSUs, Ending balance | shares 1,540
Weighted-Average Grant Date Fair Value per Share, Beginning balance | $ / shares $ 0
Weighted-Average Grant Date Fair Value per Share, Granted | $ / shares 0.31
Weighted-Average Grant Date Fair Value per Share, Vested | $ / shares 0
Weighted-Average Grant Date Fair Value per Share, Forfeited/cancelled/expired | $ / shares 0.31
Weighted-Average Grant Date Fair Value per Share, Ending balance | $ / shares $ 0.31