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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Jan. 01, 2019 | Dec. 31, 2018
Significant Accounting Policies [Line Items] |  |  |  |
Entity Incorporation Date Of Incorporation | Jan. 11, 1991 |  |  |
Options and warrants excluded from the calculation of diluted shares | 4,673,897 | 2,948,848 |  |
Production and importation permission description | 22 million pounds in 2015 and was reduced by approximately 4.5 million pounds each year ending at zero in 2020. |  |  |
Revenue from Contract with Customer, Including Assessed Tax | $ 34,664 | $ 42,428 |  |
Operating Loss Carryforwards | $ 37,400 |  |  |
Operating Loss Carryforwards, Limitations on Use | (subject to annual limitations of 80% of tax earnings) and $5.4 million expire through 2023 (subject to annual limitations of approximately $1.3 million). |  |  |
Deferred Tax Assets, Valuation Allowance |  |  |  | $ 11,300
Concentration Risk, Customer | there was one customer accounting for 15% of the Company’s revenues. | there was one customer accounting for 11% of the Company’s revenues. |  |
Operating Lease, Liability | $ 7,583 |  |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount | 13,300 |  |  |
No Expiration [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Operating Loss Carryforwards | 32,000 |  |  |
State and Local Jurisdiction [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Operating Loss Carryforwards | 22,000 |  |  |
Accounting Standards Update 2016-09 [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Operating Lease, Liability |  |  | $ 8,100 |
Financial Service [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 600 | $ 600 |  |
Customer |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Accounts Receivable, net | $ 3,000 | $ 4,000 |  |

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- Definition For an unclassified balance sheet, the amount due from customers or clients for goods or services that have been delivered or sold in the normal course of business, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(9)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(5)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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