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Series B Mandatorily Redeemable Preferred Stock (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Jun. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2015
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items] |  |  |  |  |  |
Interest expense |  | $ 2,545,203 | $ 3,076,976 |  |  |
Preferred stock extend redemption date | Aug. 01, 2019 |  |  | Aug. 01, 2018 |  |
Preferred stock redemption extension fee paid |  |  |  | $ 153,500 |  |
Preferred stock redemption extension additional fee paid | $ 153,500 |  |  |  |  |
Redeemable Convertible Preferred Stock Series B [Member] |  |  |  |  |  |
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items] |  |  |  |  |  |
Preferred stock shares issued (in shares) |  | 16,000 |  |  | 16,900 | 35,000
Preferred stock shares outstanding (in shares) |  | 16,000 |  |  | 16,900 |
Preferred stock, par or stated value (in dollars per share) |  | $ 0.01 |  |  | $ 0.01 |
Liquidation preference per share (in dollars per share) |  | $ 1,000 |  |  | $ 1,000 |
Financial instruments subject to mandatory redemption, preferred return on funds invested |  | 14.00% |  |  |  |
Deferred financing costs |  | $ 3,100,000 |  |  |  |
Interest expense |  | 61,000 | $ 19,000 |  |  |
Total unamortized deferred costs |  | $ 61,000 |  |  | $ 122,000 |
Number of shares redeemed |  | 900 |  |  | 13,800 |
Number of shares redeemed, value |  | $ 900,000 |  |  | $ 13,800,000 |
Redeemable preferred stock |  | $ 16,000,000 |  |  | $ 16,900,000 |

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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 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(28)) -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 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21484-112644 + Details
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