Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001193125-20-307955-index-headers.html | 2020-12-02 09:22:31 | |
| 0001193125-20-307955-index.html | 2020-12-02 09:22:31 | |
| 0001193125-20-307955.txt | 2020-12-02 09:22:31 | |
 0001193125-20-307955-xbrl.zip | 40083 | 2020-12-02 09:22:31 |
| bstc-20201202.xsd | 3069 | 2020-12-02 09:22:31 |
| bstc-20201202_lab.xml | 18889 | 2020-12-02 09:22:31 |
| bstc-20201202_pre.xml | 11859 | 2020-12-02 09:22:31 |
| d294149d8k.htm | 42444 | 2020-12-02 09:22:31 |
| d294149d8k_htm.xml | 3630 | 2020-12-02 09:22:31 |
| d294149dex31.htm | 6550 | 2020-12-02 09:22:31 |
| d294149dex32.htm | 145719 | 2020-12-02 09:22:31 |
| d294149dex991.htm | 10100 | 2020-12-02 09:22:31 |
| FilingSummary.xml | 1795 | 2020-12-02 09:22:31 |
| Financial_Report.xlsx | 5526 | 2020-12-02 09:22:31 |
 g294149g1202101113392.jpg | 8440 | 2020-12-02 09:22:31 |
| MetaLinks.json | 19448 | 2020-12-02 09:22:31 |
| R1.htm | 41727 | 2020-12-02 09:22:31 |
| report.css | 2767 | 2020-12-02 09:22:31 |
| Show.js | 1085 | 2020-12-02 09:22:31 |