Debt Financing - Future Minimum Payments on the Company's Current Debt, Including Payment of Principal and Interest (Detail) $ in Thousands	Dec. 31, 2019 USD ($)
Principal
2020	$ 4,554
2021	4,284
2022	1,415
Total	10,253
Interest
2020	843
2021	384
2022	65
Total	1,292
Purchase Option Fees
2020	0
2021	600
2022	1,080
Total	$ 1,680

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04.(a))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601