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Common Stock and Other Equity Related Transactions - ATM Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2019 | Jun. 30, 2018
Class of Stock |  |
Commissions paid to sales agents | $ 932 | $ 335
ATM |  |
Class of Stock |  |
Total gross proceeds | $ 59,319 |
ATM | Common Stock |  |
Class of Stock |  |
Shares of Common Stock sold (shares) | 505,236 |
Weighted average price (usd per share) | $ 117.41 |
Commissions paid to sales agents | $ 771 |

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