The young playwright Joshua Harmon made a splash with his comedy “Bad Jews” in 2012, which was initially presented at the Roundabout Theatre Company’s black-box theater and was later produced at its larger Laura Pels Theatre. The play not only got great reviews, it also received productions at numerous regional theaters around the country.

Now Roundabout is mounting another Harmon play, “Significant Other,” a romantic comedy about a gay man in his 20s watching his female friends pair up around him as he remains single and a little lonely. It stars Gideon Glick and is directed by Trip Cullman.

New York Times theater critic Charles Isherwood explains why Harmon’s new work is good summer entertainment.