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v3.20.2

Leases - Additional Information (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 21, 2020 renewal_term | Nov. 30, 2016 ft² | Oct. 31, 2014 renewal_term | May 31, 2013 ft² renewal_term | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Aug. 03, 2020 USD ($) | Jun. 30, 2020 USD ($) | Jul. 01, 2019 USD ($) | Jun. 01, 2018 ft² | Feb. 28, 2015 ft²
Leases [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accumulated deficit |  |  |  |  | $ (201,890) |  |  | $ (199,779) |  |  |
Cash payments for operating leases |  |  |  |  | 70 | $ 96 |  |  |  |  |
Cash payments for financing leases |  |  |  |  | $ 3 | $ 0 |  |  |  |  |
1st Detect |  |  |  |  |  |  |  |  |  |  |
Leases [Line Items] |  |  |  |  |  |  |  |  |  |  |
Lease, expiration date |  |  | Apr. 30, 2020 |  |  |  |  |  |  |  |
Lessee, Operating Lease, Existence of Option to Extend [true false] |  |  | true |  |  |  |  |  |  |  |
Number of renewal terms | renewal_term |  |  | 2 |  |  |  |  |  |  |  |
Renewal term |  |  | 5 years |  |  |  |  |  |  |  |
Leased premises, right of first refusal exercised | ft² |  |  |  |  |  |  |  |  |  |  | 9,138
Austin, Texas |  |  |  |  |  |  |  |  |  |  |
Leases [Line Items] |  |  |  |  |  |  |  |  |  |  |
Leased premises | ft² |  | 5,219 |  |  |  |  |  |  |  |  |
Lease, expiration date |  | Dec. 31, 2023 |  |  |  |  |  |  |  |  |
Decrease in operating lease right-of-use asset |  |  |  |  |  |  | $ 506 |  |  |  |
Decrease in operating lease liability |  |  |  |  |  |  | $ 540 |  |  |  |
Webster, Texas |  |  |  |  |  |  |  |  |  |  |
Leases [Line Items] |  |  |  |  |  |  |  |  |  |  |
Lease, expiration date | Apr. 30, 2021 |  |  |  |  |  |  |  |  |  |
Lessee, Operating Lease, Existence of Option to Extend [true false] | true |  |  |  |  |  |  |  |  |  |
Number of renewal terms | renewal_term | 1 |  |  |  |  |  |  |  |  |  |
Renewal term | 1 year |  |  |  |  |  |  |  |  |  |
Original lease area of land removed | ft² |  |  |  |  |  |  |  |  |  | 8,118 |
Leased premises remaining area | ft² |  |  |  |  |  |  |  |  |  | 17,560 |
Webster, Texas | 1st Detect | Research and Development and Production Facility |  |  |  |  |  |  |  |  |  |  |
Leases [Line Items] |  |  |  |  |  |  |  |  |  |  |
Leased premises | ft² |  |  |  | 16,540 |  |  |  |  |  |  |
Lease, expiration date |  |  |  | Jun. 30, 2018 |  |  |  |  |  |  |
Lessee, Operating Lease, Existence of Option to Extend [true false] |  |  |  | true |  |  |  |  |  |  |
Number of renewal terms | renewal_term |  |  |  | 2 |  |  |  |  |  |  |
Renewal term |  |  |  | 5 years |  |  |  |  |  |  |
Lease term |  |  |  | 62 months |  |  |  |  |  |  |
Adjustment to Opening Retained Earnings Related to Adoption ASC Topic 842 | ASU 2016-02 |  |  |  |  |  |  |  |  |  |  |
Leases [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accumulated deficit |  |  |  |  |  |  |  |  | $ 230 |  |

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