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Current Liabilities and Debt Obligations, Enlightenment Capital Credit Agreement (FY) (Details) |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
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Mar. 26, 2020 USD ($) Extension | Jul. 19, 2019 USD ($) | Jul. 18, 2019 USD ($) | Mar. 31, 2018 shares | Jan. 25, 2017 USD ($) $ / shares shares | Mar. 31, 2015 | Jun. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Apr. 18, 2017 USD ($)
Accounts Payable and Other Accrued Payables [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade account payables |  |  |  |  |  |  | $ 14,800,000 |  | $ 14,800,000 |  | $ 13,500,000 | $ 18,500,000 |  |
Accrued trade payables |  |  |  |  |  |  | $ 4,800,000 |  | $ 4,800,000 |  | $ 1,500,000 | 3,300,000 |  |
Enlightenment Capital Credit Agreement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants exercise price (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 1.321 |  | $ 1.321 |  | $ 1.321 |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior term loan principal, including exit fee |  |  |  |  |  |  |  |  |  |  | $ 17,200,000 | 11,825,000 |  |
Less: Unamortized discount, debt issuance costs, and lender fees |  |  |  |  |  |  |  |  |  |  | (865,000) | (841,000) |  |
Senior term loan, net |  |  |  |  |  |  | $ 0 |  | $ 0 |  | 16,335,000 | 10,984,000 |  |
Subsequent Events [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of quarterly maturity date extensions | Extension | 4 |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of increase in quarterly exit fee payable | $ 250,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of increase in exit fee payable | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Amendment fee and out-of-pocket costs and expenses | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Credit Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Enlightenment Capital Credit Agreement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in interest rate |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |
Credit agreement exit fee |  |  |  |  |  |  | $ 825,000 |  | $ 825,000 |  | $ 825,000 |  |  |
Effective interest rate |  |  |  |  |  |  | 15.00% |  | 15.00% |  | 15.00% |  |  |
Credit agreement transaction costs |  |  |  |  |  |  |  |  | $ 374,000 |  | $ 374,000 |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior term loan principal, including exit fee |  |  |  |  |  |  | $ 17,200,000 |  | 17,200,000 |  | 17,200,000 |  |  |
Less: Unamortized discount, debt issuance costs, and lender fees |  |  |  |  |  |  | (512,000) |  | (512,000) |  | (865,000) |  |  |
Senior term loan, net |  |  |  |  |  |  | 16,688,000 |  | 16,688,000 |  | 16,335,000 |  |  |
Interest expense |  |  |  |  |  |  | 700,000 | $ 400,000 | 1,500,000 | $ 800,000 | 2,200,000 | $ 1,700,000 | $ 1,500,000 |
Exit fee |  |  |  |  |  |  | $ 825,000 |  | $ 825,000 |  | $ 825,000 |  |  |
Class A Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Enlightenment Capital Credit Agreement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |
Porter [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Enlightenment Capital Credit Agreement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  | Jul. 01, 2017 |  |  | Jul. 25, 2022 |  | Jul. 25, 2022 | Jul. 01, 2017 |  |
Aggregate redemption price |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,112,000
Enlightenment Capital Solutions Fund II LP [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Enlightenment Capital Credit Agreement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior term loan |  | $ 16,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  | Jan. 15, 2021 | Jan. 25, 2022 |  |  |  |  |  |  |  |  |  |  |
Credit agreement exit fee |  | $ 1,200,000 | $ 825,000 |  |  |  |  |  |  |  |  |  |  |
Effective interest rate |  | 17.30% |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional borrowings |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 16,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Prepayment price percentage for January 26, 2019 to January 25, 2020 |  | 102.00% |  |  |  |  |  |  |  |  |  |  |  |
Prepayment price percentage for January 26, 2020 to October 14, 2020 |  | 101.00% |  |  |  |  |  |  |  |  |  |  |  |
Agent fee |  | $ 110,000 |  |  |  |  |  |  |  |  |  |  |  |
Exit fee |  | $ 1,200,000 | $ 825,000 |  |  |  |  |  |  |  |  |  |  |
Number of quarterly maturity date extensions | Extension | 4 |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of increase in quarterly exit fee payable | $ 250,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of increase in exit fee payable | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Amendment fee and out-of-pocket costs and expenses | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Enlightenment Capital Solutions Fund II LP [Member] | Class A Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Enlightenment Capital Credit Agreement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued to purchase shares of common stock (in shares) | shares |  |  |  |  | 1,135,284.333 |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |
Percentage of warrants issued of common equity interests |  |  |  |  | 2.50% |  |  |  |  |  |  |  |  |
Warrants exercise price (in dollars per share) | $ / shares |  |  |  |  | $ 1.321 |  |  |  |  |  |  |  |  |
Warrants expiration date |  |  |  |  |  |  | Jan. 25, 2027 |  | Jan. 25, 2027 |  | Jan. 25, 2027 |  |  |
Emmett J. Wood [Member] | Class A Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares held by related party (in shares) | shares |  |  |  | 50,000 |  |  | 810,000 |  | 810,000 |  | 810,000 |  |  |
Term loan [Member] | Porter [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Enlightenment Capital Credit Agreement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in interest rate |  |  |  | 1.00% |  |  |  |  |  |  |  |  |  |
Term loan [Member] | Enlightenment Capital Solutions Fund II LP [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Enlightenment Capital Credit Agreement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior term loan |  |  |  |  | $ 11,000,000 |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  |  |  | Jan. 25, 2022 |  | Jan. 25, 2022 |  |  |
Accrual rate |  |  |  |  | 13.00% |  |  |  |  |  |  |  |  |
Increase in interest rate |  |  |  |  | 14.50% |  |  |  |  |  |  |  |  |
Increase in interest rate in event of default |  |  |  |  | 2.00% |  |  |  |  |  |  |  |  |
Monthly accrued interest rate |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |
Monthly accrued interest rate during continuance of an Alternate Interest Rate Event |  |  |  |  | 11.50% |  |  |  |  |  |  |  |  |
Number of days prior written notice |  |  |  |  |  |  |  |  | 30 days |  | 30 days |  |  |
Proceeds from loan prepayment |  |  |  |  | $ 1,100,000 |  |  |  |  |  |  |  |  |
Long-term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 11,000,000 |  |  |  |  |  |  |  |  |
Term loan [Member] | Enlightenment Capital Solutions Fund II LP [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Enlightenment Capital Credit Agreement [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Monthly accrued interest rate |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |

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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: 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(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: 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(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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- Definition Amount of increase (decrease) of the credit facility. + References Reference 1: 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.(f)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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- Definition The redemption (or callable) amount of currently redeemable preferred stock. Includes amounts representing dividends not currently declared or paid but which will be payable under the redemption features or for which ultimate payment is solely within the control of the issuer. + 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 210.5-02.27(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21564-112644 + Details
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- Definition Carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion. Senior note holders are paid off in full before any payments are made to junior note holders. + 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 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Expiration date of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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