Organization and description of business operations - Merger Agreement (Details)	May 18, 2020 $ / shares shares	Jun. 30, 2022 $ / shares shares	Dec. 31, 2021 $ / shares shares
Merger Agreement
Common stock, par value (in dollars per share) | $ / shares		$ 0.001	$ 0.001
Common shares outstanding		63,753,834	63,619,140
VARs
Merger Agreement
Outstanding at the ending (in shares)		227,277	359,487
Merger Agreement
Merger Agreement
Common stock, par value (in dollars per share) | $ / shares	$ 0.001
Conversion reverse stock split ratio	0.0833
Common shares outstanding	11,849,031
Merger Agreement | BioPharmX
Merger Agreement
Outstanding common stock owned	88.50%
Merger Agreement | Timber Sub
Merger Agreement
Ownership held by stockholders	11.50%
Common stock issued per unit	629.57
Common stock issued for VARs	367,670
Preferred units before merger	1,819,289
Merger Agreement | Timber Sub | VARs
Merger Agreement
Outstanding at the ending (in shares)	584
Merger Agreement | Timber Sub | Series A preferred stock (if converted)
Merger Agreement
Common stock on conversion of units	1,819