Related Party Transactions - Narrative (Details) - USD ($)
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1 Months Ended |
12 Months Ended |
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Aug. 24, 2017 |
Jul. 31, 2017 |
Apr. 30, 2017 |
Oct. 31, 2016 |
Dec. 31, 2018 |
Dec. 31, 2017 |
Aug. 31, 2017 |
Jan. 31, 2017 |
Dec. 31, 2016 |
Sep. 30, 2016 |
Aug. 31, 2015 |
| Related Party Transaction [Line Items] |
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| Payments for repurchase of common stock |
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$ 0
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$ 4,507,000
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| Grants in period (in shares) |
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810,628
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| Accounts payable due to related parties |
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0
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| Affiliated Entity |
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| Related Party Transaction [Line Items] |
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| Revenue from related parties |
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$ 40,000
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300,000
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| Number of shares authorized to be repurchased |
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813,140
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| Authorized amount |
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$ 3,700,000
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| Payments for repurchase of common stock |
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$ 2,800,000
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$ 1,700,000
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$ 2,000,000
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| Stock repurchased during period (in shares) |
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406,570
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440,040
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| Accounts payable due to related parties |
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0
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| Immediate Family Member of Management or Principal Owner |
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| Related Party Transaction [Line Items] |
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| Revenue from related parties |
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900,000
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600,000
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| Accounts receivable |
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$ 200,000
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100,000
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| Grants in period (in shares) |
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20,580
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| Vesting period |
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4 years
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| Cash reimbursement per day for services |
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$ 4,500
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| Purchases from related party |
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90,000
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120,000
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| Executive Officer |
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| Related Party Transaction [Line Items] |
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| Principal balance outstanding |
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$ 200,000
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| Convertible Debt | Related Party Convertible Notes Payable | Affiliated Entity |
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| Related Party Transaction [Line Items] |
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| Conversion of related party convertible notes payable into ordinary shares |
5,869,417
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| Principal balance outstanding |
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0
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0
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| Notes Payable | Affiliated Entity |
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| Related Party Transaction [Line Items] |
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| Principal balance |
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$ 1,200,000
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| Notes Payable | Seven Percent Notes Payable | Affiliated Entity |
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| Related Party Transaction [Line Items] |
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| Principal balance outstanding |
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$ 0
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4,218,000
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$ 4,300,000
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| Principal balance |
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$ 4,200,000
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| Line of Credit | Madryn Credit Agreement |
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| Related Party Transaction [Line Items] |
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| Principal balance outstanding |
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$ 40,000,000
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| Maximum borrowing capacity |
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$ 55,000,000.0
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| CPH TU, L.P. | Convertible Debt | Related Party Convertible Notes Payable | Affiliated Entity |
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| Related Party Transaction [Line Items] |
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| Related party ownership percentage of company |
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37.10%
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| Madryn |
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| Related Party Transaction [Line Items] |
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| Related party ownership percentage of company |
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3.60%
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