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Revenue Recognition - Contract Liabilities (Details) - USD ($) | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Dec. 31, 2018
Deferred revenue |  |  |  |
Advance payments from customers |  |  | $ 75,830 | $ 180,425
Shipments in-transit |  |  | 121,599 | 9,582
Extended warranty agreements |  |  | 3,658,078 | 3,415,782
Total | $ 3,605,789 | $ 3,621,256 | $ 3,855,507 | $ 3,605,789
Changes in contract liabilities |  |  |  |
Contract liabilities at beginning of the year | 3,605,789 | 3,621,256 |  |
Increases due to cash received from customers | 1,646,638 | 1,314,024 |  |
Decreases due to recognition of revenue | (1,396,920) | (1,008,979) |  |
Contract liabilities at end of the year | $ 3,855,507 | $ 3,926,301 |  |

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130532-203044 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 + Details
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- Definition Amount as of the balance sheet date of the aggregate extended product warranty liability. Does not include the ending balance for the standard product warranty liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c)(1),(c)(5) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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